The Prime Minister this evening declared Covid vaccines are safe - and said he would be getting his tomorrow.
Boris Johnson said he would receive an Oxford/Astrazeneca vaccine, and said research had shown the jab was safe.
He admitted that there is an issue with vaccine supply for the coming weeks - but said his roadmap for reopening the country is still on target.
He stated from a briefing at Downing Street: "The Oxford vaccine is safe, the Pfizer vaccine is safe, the thing that isn't safe is catching Covid."
He said that with more than 25 million people vaccinated, there is "no change" to his roadmap, stating: "We remain on track to return to the things we love."
But he said that was dependent on data showing the country is defeating the virus.
England's chief medical officer Prof Chris Whitty echoed Mr Johnson's view, calling on people to continue taking vaccine when offered.
"By being vaccinated people protect themselves, but they also reduce the risk of passing the virus to other people," he said.
He said: "The overwhelming professional view is that these vaccines are highly effective and very safe."
MHRA regulator chief Dr June Raine said that the benefits of the vaccine by far outweigh the risks.
Dr Raine said the MHRA is investigating reports of blood clots, as a precautionary measure it advises "anyone with a headache that lasts more than four days after vaccination or bruising beyond the site of vaccination after a few days to seek medical attention".
The European Medicines Agency this afternoon declared the jab safe after a number of countries halted its use.
Earlier today the government announced that 5.7million vaccine doses have been delayed due to two separate problems.
The Prime Minister this evening said: "Let me assure you that if you come forward after receiving your letter, we have the jabs for you.
"We've always said in a vaccination programme of this pace and scale some interruptions in supply are inevitable and it is true that in the short-term we're receiving fewer vaccines than we had planned for a week ago.
"That is because of a delay in a shipment from the Serum Institute, who are doing a Herculean job in producing vaccines in such large quantities, and because of a batch that we currently have in the UK that needs to be retested as part of our vigorous safety programme.
"So, as a result, we will receive slightly fewer vaccines in April than in March, but that is still more than we received in February."
Health Secretary Matt Hancock said two issues have emerged after the NHS warned of a "significant reduction" in supply from March 29.
The first is a four-week delay to 4million doses from the Serum Institute in India, which had been ordered from the UK.
Mr Hancock then revealed there was a second issue with 1.7million separate doses, which needed to be re-tested.
However, he insisted that while parts of the roll-out will be later than some hoped, he was still on track to meet the target of giving a first dose to all over-50s by April 15 and all adults by July 31.
He added there were no changes to prioritisation or appointments already booked.
The European Medicines Agency (EMEA) has declared Oxford/AstraZeneca's vaccine safe for use after its use was halted in some countries.
The body has announced its verdict on the safety of the vaccine after some European Union countries suspended its use over blood clot fears, adding that it plans to continue carrying out more investigations.
EMEA officials said the body cannot 'definitively' rule out a link between a small number of clot death cases and the vaccine.
However the benefits of the vaccine outweighed the risk, the regulator said.
The body was committed to raising awareness of the possible risks for European citizens, officials said.
