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We’re not just here to bring you the best web dramas — we’re also part of a powerful wellness network for men that cares about your performance both on screen… and in the bedroom.
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Short filmTranscript
00:00Three trillion trees blanket our world.
00:12From spectacular cherries in spring,
00:17to the golden maples of North America,
00:22and the strange-looking baobab trees of Madagascar.
00:30They can bring us joy...
00:34..and even keep us alive.
00:38All these amazing trees around us give us the air that we breathe.
00:43But what do we really know about their hidden world?
00:47As you get closer to the tree, it just gets more and more remarkable.
00:52In this series, we'll follow their incredible lifespans.
00:56There are trees alive on Earth today that are as old as the Great Pyramids.
01:01Discover how trees communicate.
01:04This whole wood is interconnected,
01:08and that opens up so many possibilities.
01:11And learn how they survive in some of the toughest places on Earth.
01:15In this first episode, we're beginning with birth.
01:27And the journey to become an adult.
01:32As we reveal how trees mate.
01:35These flowers aren't for us.
01:39They're bold for trees to have sex.
01:42And even how a growing tree drinks.
01:46I can hear it.
01:48Oh, what a lovely sound.
01:51You'll never look at a tree in the same way again.
01:54There are more than 70,000 species of tree on our planet.
02:15But they all begin life in the same way.
02:25Even the giants of the tree world.
02:30The redwoods.
02:31The largest trees on Earth live in Northern California.
02:46Towering up to 116 metres, they're taller than the Statue of Liberty.
02:51Redwoods grow in Europe too.
03:06And some of the biggest are found at Benmore Botanic Garden
03:10in Western Scotland.
03:14Tony Kirken was the head of trees at Kew Gardens.
03:17He's spent a lifetime around the world's greatest trees.
03:24I spent 50 years of my professional career working with trees.
03:30And I'm still learning about them every day.
03:37So these trees are the giant redwoods.
03:40And they're my favourite trees.
03:42And I think it's probably because of the sheer size that they make.
03:45And how long they live for.
03:48Up to 3,000 years old.
03:50And they can have trunks about 8 metres diameter.
03:53So they, you know, they are monsters.
03:58These were planted in 1863.
04:01So they're just about 160 years old.
04:06They're taller than Nelson's Column.
04:08To put things into perspective.
04:1050, 55 metres.
04:11So they're tall.
04:14But like almost all trees, even these giants begin life as something tiny.
04:27Little seeds.
04:28So one of the incredible things about these massive trees is that they come from a seed this small.
04:37So tiny.
04:38Most people would think it would be the size of a coconut, you know, to make a tree this big.
04:42But they are minute.
04:43They are minute.
04:45To think that something so small can generate something so massive.
04:50All the redwoods and all the trees on the planet, three trillion of them, all grow from something so small.
04:58I think that's pretty amazing, astonishing actually.
05:08But how are seeds actually made in the first place?
05:12For many trees, the creation of new life begins with one of the most beautiful displays in the natural world.
05:27Blossom.
05:28For a few brief weeks in spring, trees are painted in a fresh coat of color.
05:43As their flowers burst into life.
05:45into life.
05:51From the vivid pinks of Japan's cherry trees, to the pastel shades of almonds, apples, peaches
06:00and plums, and from magnolias to the vibrant pomegranate tree.
06:15But as beautiful as it looks, all this colour isn't for us.
06:21It has a very important job, helping the tree to create new life in the form of seeds.
06:33This is one of my favourite times of the year, when all the colour starts to appear back into
06:38the countryside after such a long, barren, bleak winter.
06:43Biologist Connor Butler is visiting elder trees.
06:49Each elder has thousands of flowers, many more than most blossom trees.
06:57And in this orchard at Beaver Farm, the sweet-scented blooms are bursting into life.
07:05Connor is here to unlock the mystery of why many trees produce blossom.
07:10This field is filled with thousands and thousands of flowers, and it smells really incredible
07:15right now.
07:16But these flowers aren't for us.
07:18They evolve for trees to have sex.
07:21Like us, to mate the next generation, trees need to reproduce.
07:32But when it comes to mating, they have a major problem.
07:37They are literally rooted to the spot.
07:40So unlike us, trees can't move.
07:42So in order for them to find a mate, they've actually got to find a pretty ingenious way
07:46to do that.
07:47And the way they've done that is to have flowers.
07:50The clever trees are using flowers to attract something that can move, bees and other insects,
08:08to help them mate.
08:10So I've just caught this bee off this elderflower tree here.
08:14And this bee is visiting all of the flowers.
08:17And these flowers are really brightly coloured, they smell fantastic.
08:21And they contain a really sugary liquid called nectar.
08:24And the trees produce that nectar to try and attract these pollinating insects in.
08:30The flowers look beautiful to us, but for insects, they look a whole other level of attractiveness.
08:35Trees use their bright flowers and sweet-smelling nectar to lure in the bees.
08:45And whilst the bee is getting a tasty treat, the tree gives it something else to take away.
08:53Pollen.
08:55So pollen is essentially tree sperm, and it wants to get that pollen as far away as possible
09:00to a tree which could be hundreds and hundreds of metres away.
09:02So it uses bees and other insects to do that travelling.
09:08On beautiful spring days, as the air is filled with the scent of flowers, it also hums with
09:17the soundtrack of insects.
09:23A single bee can visit more than a thousand flowers in one day.
09:32Bees and trees working together to create a seed.
09:36So let's have a closer look at some of these flowers.
09:40What we can see here are the male parts, which are a bit kind of yellowish in colour.
09:44They're kind of sticking up out of the flower.
09:46And on each one of these is loads and loads of pollen grains.
09:50And when a bee or an insect visits the flower, it gets covered in this really dusty pollen.
09:55And when it's had its fill, it flies off to another flower.
09:57When it lands on that flower, it then deposits that pollen onto the female part, which is
10:03right in the centre of this flower.
10:04The pollen will make its way to an egg hidden inside.
10:11And that is the moment of conception, and that is where the seed starts to form.
10:23And actually, on some of these bunches here, we can see the petals have dropped off and
10:28that will then swell and starts to grow into a seed.
10:35Most blossom only lasts a few short weeks in spring.
10:39Once the tree has shed its petals, it focuses its energy over the summer months, growing
10:45thousands of brand new seeds.
10:56But fewer than one in a thousand newly created seeds will make it into adulthood.
11:06So for many, there's a long and precarious journey ahead.
11:11It's summertime.
11:29And for trees, it's an important season for their precious offspring.
11:36The seeds are growing fast, and soon they'll be ready to leave home.
11:46To get the best start in life, they must take root far from the parent tree.
11:53And many have adopted ingenious ways to travel.
12:04Some use the wind, like the cleverly shaped helicopter seeds of sycamores and maples, catching
12:13a gust to be scattered far and wide.
12:21Other seeds are tucked away inside colorful fruits to entice hungry animals.
12:30They eat the fruit, but leave the seeds behind to take root away from the parent tree.
12:38And then, from the bare soil, a brand new tree begins to grow.
12:54But for many infant trees, the next stage of life can be challenging.
13:06In Italy, the steep slopes along its southern coastline are the perfect place to grow lemon
13:14trees.
13:20Salvatore Iaceto tends to 2,600 amalfi lemon trees on a 12-acre farm his family has worked
13:29for two centuries.
13:32I represent my sixth generation in the lemon farm, the business.
13:38The lemons are everything for us.
13:42We have a connection with the plants.
13:43We consider our plants like our relatives, part of our family.
13:48In our veins, we don't have blood, we have lemon juice.
13:57In Salvatore's orchard, he has a special nursery for the youngest infant trees.
14:07Lemon trees grow up fast, and by the age of just five, they're producing their own juicy fruit.
14:19It's huge.
14:26You can eat it like an apple.
14:28It is very sweet.
14:30You can't imagine.
14:35But there's a problem.
14:39Just like any infant, Salvatore's young trees can be reckless.
14:46These inexperienced youngsters are making more fruit than their slender branches can bear.
14:54We are having a lot of trouble on the young trees because when the plant has too much lemons, it can be a little bit dangerous.
15:05The young trees get so carried away producing lemons, they're at risk of snapping their branches.
15:13So they're given a frame to hold onto as they grow.
15:17To support the lemons, we're tired, and we use it like a scaffolding because it's the same as human nature.
15:24When you are young, you need more attention to the father, to the mother.
15:28It's the same for the plants.
15:31It's the same as baby in the cradle.
15:37They stay nice, they have a support, and they can grow them better.
15:45Once they're matured, the trees can safely bear huge quantities of giant lemons.
15:52We have to wait 15, 20 years.
15:55This tree, like for example, this tree can give me 150 kilograms.
16:02Salvatore's tiny slice of the Amalfi Coast produces 70 tons of luscious lemons a year.
16:13And I know many people don't believe, but when I sell my lemons, I am jealous.
16:17I don't want to give up because I consider my lemons like a baby.
16:21I don't want to give my baby.
16:29After a long day in the orchard, Salvatore's wife Giovanna uses their precious fruit to make a meal for two.
16:38The lemons are everything for us.
16:47I eat, I drink lemons, I see lemons sometimes, I drink lemons.
16:51With this spaghetti, she cooks very well, it's simple.
16:57At the end of the day, what else?
16:59Spaghetti, the taste is very, very nice, a simple food.
17:04And the lemon zest, the lemon sauce, it's fantastic.
17:17From lemon trees growing in the Italian sunshine...
17:21..to 11,000 trees thriving in one of the most famous gardens in the world.
17:32The Royal Botanic Gardens at Kew in London is home to 2,000 different species of tree.
17:43It's the perfect place to find out how young trees mature into adulthood.
17:55Just like us, all growing youngsters need to eat.
18:03And for a tree, its food is sunlight, which it gathers with its leaves.
18:10Cecily Withall is a member of Kew's tree gang.
18:18Her job is to keep a watchful eye on the health of the garden's trees.
18:24As a child, I'd climb trees a lot, and my family now find it hilarious
18:35that I'd climb trees for a job as a grown-up.
18:38To get to literally work with these trees every day,
18:41it really is something that is beyond wonderful.
18:45The leaves at Kew span every conceivable shape, colour and size.
18:57Today, Cecily is checking up on some of her favourite trees.
19:03Starting with one that has some of the biggest leaves.
19:08The Indian bean tree, otherwise known as catalpa.
19:14So, as you can see, this is a huge leaf on the catalpa,
19:21and some can reach up to 30 centimetres in length,
19:24which is really big compared to other species of tree.
19:30Big leaves are ideal for taking on the most important job for any tree,
19:35feeding itself.
19:39The most amazing things that trees do is their ability to make their own food.
19:43So, we, as humans, have to source our food to fuel our bodies.
19:48But the tree here is making its own.
19:52Trees are very, very clever, and they do something called photosynthesis.
19:56And that's when they're taking in the sun's energy through the sunlight
20:00that penetrates the leaf.
20:01When you look at that, it's a huge leaf.
20:05It's a huge leaf.
20:06It's giving the most surface area to collect the light.
20:10Leaves combine the energy from the sun with water sucked up from the ground,
20:17as well as carbon dioxide from the air.
20:20A remarkable recipe that creates trees' food.
20:25I think it's pretty amazing that leaves are able to make and produce their own food,
20:30whereas we're still popping off to the shops.
20:37To catch as much nourishing sunlight as they can,
20:40trees spread their leaves over as great an area as possible.
20:45One single tree can grow two billion leaves.
20:58And all these leaves don't just feed the tree.
21:02By soaking up carbon dioxide from the air,
21:05trees also help to combat climate change.
21:12This purple-leaved oak has a vast leaf canopy.
21:17The thousands, hundreds of thousands of leaves covering this tree
21:20are doing such a huge job.
21:23It's spread out here as much as possible to make the most of that sunlight,
21:27and it's competing against all the trees around it as well.
21:31That's why you see canopies stretching out past other trees
21:34to really push them into the sunlight.
21:37They'll push their leaves and their branches...
21:39They'll push their leaves and their branches out
21:42to find that source of the sun,
21:44because they obviously need it to find that source of the sun,
21:47because they obviously need it to survive.
21:55Not far away is another of Q's gems,
21:59a tree with a distinctive leaf shape...
22:02..the ginkgo.
22:09I think it's really hard not to create bonds
22:12with certain trees in the garden,
22:13and I think I've got a secret bond with the ginkgo,
22:16just because of its history and lineage.
22:19This tree was known to be growing 200 million years ago,
22:27and we still find fossils now
22:29that look identical to the leaf shape of the ginkgo.
22:32Ginkgo's are one of the most ancient species of tree living on Earth.
22:44It's remarkable to think that leaves just like this
22:48were eaten by dinosaurs.
22:50But growing trees can't reach adulthood on sunlight alone.
23:03They need to drink vast amounts of water.
23:08But that begs the question,
23:11how do they survive in some of the hottest places on our planet?
23:15As a new day dawns,
23:34young trees stretch out their leaves towards the rising sun,
23:41gathering its energy as food.
23:47But growing trees can't live on sunlight alone.
23:53They must drink water.
23:59And finding enough to quench its thirst
24:02is a life-or-death challenge for a fragile young tree.
24:06But how does a tree survive
24:13if its home is a desert?
24:20Acacia trees grow in a part of Israel
24:23where it rains less than an inch in a whole year.
24:30To thrive, these trees have extra-long roots
24:34and grow in places where they can tap
24:36into underground sources of water,
24:41some as deep as 30 metres.
24:50In Madagascar,
24:51there's one of the planet's most unusual-looking trees,
24:56the otherworldly baobab.
24:59Known as the camels of the tree world,
25:05the wood inside their giant trunks
25:08acts like a sponge.
25:14Incredibly,
25:14each tree can suck up and hold
25:17120,000 litres of water.
25:23That's as much as one of us would drink in 100 years.
25:29In Australia,
25:39eucalyptus trees also manage to thrive in scorching heat.
25:46These young trees are some of the fastest-growing on Earth.
25:51They need to drink a lot of water.
25:53So, what does a tree do to quench its thirst?
26:03Wildlife sound recordist Ellie Williams
26:05is hoping to reveal exactly how they do it.
26:13When you look at a tree,
26:14it doesn't seem that similar to us.
26:16They seem still and passive,
26:19and yet they share so many needs that we do.
26:22They need nutrients,
26:24they need to grow and they need to drink.
26:30Ellie believes that she can find out how a tree drinks
26:33simply by listening.
26:35This plantation is full of lots of different age eucalyptus trees.
26:42This one's really young and it's got really beautiful leaves
26:45with kind of pink veins and a pink rim.
26:48And the leaves are a really different shape as well
26:50in young eucalyptus trees,
26:52and nobody really knows why.
26:54But there are some older trees in the other side,
26:57so I'm going to wander over there now.
27:14This thirsty, teenage tree is already ten metres tall
27:20and should be ideal to listen to while it drinks.
27:24This is my contact mic.
27:26And it does this magic thing of picking up
27:28the tiniest vibrations or sound waves
27:32through this metal pin.
27:49It's quite windy today.
27:51The first thing I notice is the kind of really warm rumblings,
27:54and that's the big vibrations as the tree sways in the breeze.
28:03As she tunes in,
28:05Ellie taps into fainter sounds from within the tree.
28:14The breeze has slowed down a little bit,
28:17which might give me a chance to hear this really delicate sound.
28:20It's the sound I really want to hear.
28:23And if I'm lucky...
28:28OK, that might have been one.
28:31Oh, yeah, yeah, yeah, yeah, there was a little gurgle.
28:33I can hear it.
28:34Oh, what a lovely sound.
28:36It's like the most gentle little kind of series of bubbles.
28:39These faint popping noises are the sounds the young tree is making as it drinks.
28:51Defying gravity as it sucks water all the way up its long trunk.
29:06Defying gravity as it sucks water all the way up its long trunk.
29:13So trees are full of these tiny little tubes.
29:18Imagine hundreds and hundreds of metres of tiny little drinking straws.
29:22And what the tree does is it pulls water and nutrients from the soil through the roots,
29:29up through the trunk, into the branches, into the leaves.
29:33It's just these tiny little bubbling, popping sounds.
29:39So that's basically the sound of air mixing with the water in the tubes.
29:45And eucalyptus trees are so, so thirsty.
29:48Each tree can drink about a bathtub's worth of water a day.
29:53You put these on and there's a whole other world going on.
30:00And it's loud and it's dramatic and it's beautiful.
30:05So we kind of feel that trees aren't doing that much, but they're doing so much.
30:10It makes you realise that there is all this life and movement happening all the time,
30:15but we just don't notice it.
30:16The secret life of trees is happening all around us.
30:34Young trees that started life as tiny seeds are getting taller and stronger.
30:39But like most teenagers on their journey towards adulthood,
30:48the speed at which they grow is incredibly varied.
30:56Some trees gain height quickly.
31:00These weeping willows can grow by nearly three metres in a single year.
31:09They have far-reaching roots that draw on the abundance of water around them.
31:17Some of the slowest growing trees live high up in America's Rocky Mountains.
31:24This is the home of the whitebark pine.
31:31The trees spend eight months of the year shrouded in snow,
31:35leaving them just four months to grow.
31:41And to reach their adult size, it takes these pines an incredible 250 years,
31:50a quarter of a millennium.
31:56Every tree on earth is fed and nourished by gathering sunshine with their leaves
32:03and water from their roots.
32:06But how exactly do trees physically grow?
32:20In the new forest, Forestry England archaeologist,
32:25Lawrence Shaw, has an unusual way of finding out.
32:29When I'm walking through forests, I think it's probably a very different experience to most other people.
32:36As others might be listening out for birds or looking at the wildlife.
32:40I'm interpreting how people have interacted with this landscape over millennia.
32:45Lawrence is looking for tree graffiti.
32:53The carvings that people have made on trees in the past.
32:56Isn't this tree just beautiful and it's absolutely littered with historic tree graffiti.
33:03People leaving their mark.
33:05They can date back hundreds, sometimes thousands of years and they can connect us to individuals,
33:13specific events, a whole host of different things.
33:15So we have two initials here and a beautifully signed signature of T.B. James and the year of 1944,
33:24all carved into the tree bark of this beech tree.
33:27And we know that American service personnel were stationed here in advance of the D-Day landing.
33:33And there's every probability that T.B. James was an American serviceman who was part of that assault on Normandy,
33:40on that fateful night that was going to shape the war and the world for years to come.
33:50These days we shouldn't carve our names into trees as it can harm them.
33:55But these inscriptions from history can help Lawrence uncover the secret of how this beech tree has grown.
34:03Whilst the tree is several metres taller than it was during the Second World War,
34:12the carving itself hasn't moved any higher.
34:16It's been, yeah, 18 years since.
34:18But what's lovely to see is that it's still at exactly the same height that that individual carved those.
34:24So whilst the tree has grown upwards, this has stayed where it is.
34:33This tells us that the tree has gained all its new height at the top of its trunk,
34:42rather than growing upwards from its base.
34:46Now Lawrence is in search of older tree graffiti,
34:51to see if the same is true even after hundreds of years have passed.
34:56So the new forest was created by William the Conqueror in 1079 as a royal hunting forest.
35:11Over the next seven centuries, thousands of trees were planted for England's kings and queens.
35:21Oaks provided wood for the warships of Henry VIII,
35:25and Elizabeth I.
35:30And Lawrence knows of a special tree still standing that was growing in the 1800s,
35:37when George III's navy was fighting sea battles against Napoleon Bonaparte.
35:49So this is a lovely example of a king's mark on this beech tree.
35:53So you've got the shaft of the arrow coming down the trunk of the tree,
35:56with the two returns making the point of the arrow there.
35:59And this is used to mark and infantry trees that are going to be used for shipbuilding.
36:07The arrow told foresters not to cut it down.
36:10The wood was to be saved for a warship.
36:15The mark on this beech tree was made around 200 years ago.
36:21At the time, the tree was still young and only a few metres tall.
36:25Over the past two centuries, the tree has added at least 20 metres in height,
36:33and yet the mark hasn't moved at all.
36:37I'm basically stood at the same head level as the individual that drew this carving.
36:43200 years ago, this tree would have been thinner,
36:46but the mark itself is at the same position that it was drawn at that time.
36:52What's lovely about historic tree graffiti is that they demonstrate
36:55the growing processes of trees. It may warp as a tree grows wider.
37:03But certainly these things don't disappear up with the tree.
37:05The 200-year-old carving proves that trees don't grow from the base of their trunk.
37:16Instead, as they get taller, all the tree's growth happens higher up,
37:23as it stretches its branches towards the sunlight.
37:26If trees do most of their growing throughout the warm summer months,
37:37how do they prepare themselves for the freezing weather of winter?
37:42It's autumn, a spectacular time in a tree's calendar.
38:04After gathering in the sunlight of summer,
38:07many trees must do one last remarkable thing
38:10before they can rest over winter.
38:18This is Forestry England's Westonbert Arboretum in Gloucestershire.
38:29Arborist Joe Porter looks after its 15,000 trees.
38:40He's fascinated by why, in autumn, many erupt into a riot of colour.
38:46As you can see, the trees are putting on some lovely colour for us.
38:51It's great to see so many people enjoying all of these beautiful trees and enjoying having that
39:01connection with nature. With the busyness of our job, every now and then it is quite nice just to stop,
39:08take a look and see this colour and it lifts your spirits a little bit. But it's also not just for us
39:13that they're doing this. There's also a lot of important stuff going on inside the trees as they prepare for winter.
39:20Many of the two and a half thousand species of trees here are deciduous,
39:32which means they lose their leaves every year after a flourish of autumn colour.
39:39And none are more dramatic than the acers.
39:49Acer is the botanical name for a maple tree. You tend to see a lot of these plants in people's gardens.
39:56The leaf shape looks like your hand. It helps them with wind deflection.
40:01The wind can move through the leaves and it causes less damage when it does get up to high winds.
40:09They're a little bit of a marker for when autumn has come. They go in this beautiful colour and they
40:13brighten up people's gardens when the gloomy weather comes and they're just this brilliant
40:17sort of show at the beginning of autumn.
40:21But why do leaves change their colour from green to vibrant shades of red and gold?
40:30So this time of year, as autumn moves through and we move into winter,
40:34the trees have got to prepare themselves for shorter days and colder temperatures.
40:39Leaves could get damaged in winter with frostbite, high winds,
40:43so they've got to prepare themselves and get themselves ready for this hibernation time of year for them.
40:49Over the summer, the leaves have been gathering energy from sunshine.
41:01In autumn, the colour changes we see from greens to oranges, yellows and reds
41:10are caused by the trees stopping this food-making process.
41:14When we see green leaves like this, it's because they're full of what we call chlorophyll.
41:23It's a chemical inside the leaf that helps the tree to photosynthesise and create food for itself.
41:33What we see throughout the process of autumn is the breakdown of that chlorophyll
41:37as it draws all of its good nutrients back into itself.
41:43Trees sense the shorter days and cooler air of autumn.
41:49It triggers them to claw back their harder nutrients, removing the green and revealing the naked leaf beneath.
41:57And what we are seeing is this natural hue in behind, which is the colour that is present all year round,
42:06but you just don't see it because the chlorophyll is so dominating in its colour.
42:09As the trees slowly break down the chlorophyll, different combinations of chemicals are left behind.
42:21They've had this gradual transition throughout autumn,
42:25trying to get that every last bit of sunlight that they can before winter comes along.
42:30So here we have one of our younger acers. You can tell it's a really good and healthy and vigorous tree.
42:52Quite often when you see trees dropping their leaves, it can be seen as quite a sad thing,
42:56but it's a really positive move for the tree as it hunkers down for the winter, protects itself,
43:03and then there's some tiny little buds starting to poke through, which means it's ready come springtime
43:08to sort of burst forth and continue producing its food from its leaves.
43:13And in a few days or weeks, this spectacle will be over.
43:30As trees let the wind carry away the leaves they no longer need.
43:34For every deciduous tree, it's a vital stage in their long lives.
43:48As they fall into a winter slumber, they've ensured that they have saved enough energy to get taller
43:56and stronger for next spring and the year ahead.
44:07Next time, we follow trees in the prime of their lives, as they do the most extraordinary things.
44:15These trees here, they are essentially talking to each other.
44:19Adapting to withstand attacks from nature.
44:24And from us.
44:25You had chimneys belching out, smoke, soot, and this tree managed to deal with that.
44:32As they grow into the largest living things on the planet's surface.
44:38It blows my mind.
44:39Even though I've been working with trees for 50 years, it still fascinates me how they stand up.
44:44For more information about the secret life of British trees, go to the Woodland Trust.
44:51At woodlandtrust.org.uk
44:55Slash trees
44:57The Secret Life of Trees continues brand new next Friday at nine.
45:05From North Korea to Nigeria, follow Michael Palin's adventures around the world, streaming now on five.
45:11And what makes Princess Anne a quite remarkable royal?
45:15We explore her extraordinary career, brand new tomorrow at nine.
45:19Next, lip reading the royals, The Secret Conversations.
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