Boris Johnson sets out the distribution plan for the Pfizer/BioNTech Covid-19 vaccine which has been approved for use in the UK. The prime minister also warned the public against “over-optimism” and against falling “into the naive belief” that the struggle against the coronavirus is over. His comments come as England enters a regional tiered system of restrictions following a month-long national lockdown. Report by Jonesia. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn