The Duke and Duchess of Edinburgh attend a puppy training class at the Guide Dogs for the Blind Association Training Centre as part of Coronation celebrations for 'The Big Help Out'. The pair instructed golden retrievers and black Labradors, teaching the dogs how to put harnesses on and avoid tempting treats. Report by Rowlandi. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn