The MHRA said there were no reports of blood clots from the Pfizer-BioNTech vaccine it said, adding that "our thorough review into these reports is ongoing".
Despite the increasing evidence of a small link between the AstraZeneca jab and blood clots, there has been no evidence of reduced takeup among the British population.
Some 670,000 vaccine doses, including both Pfizer and AstraZeneca versions, had been administered to people as of Thursday.
However, the health officials said they still believe the benefits of the vaccine in the prevention of Covid-19 far outweigh any possible risk of blood clots.
Germany restricted the use of the shot to people over 60 years of age, France has limited its use to those over 55.
But the Australian Technical Advisory Group on Immunisation (ATAGI) and the Therapeutic Goods Administration (TGA) did not recommend changes to the vaccine rollout, acting chief medical officer Michael Kidd said on Saturday.
The European Medicines Agency is expected to update its recommendation on this issue on April 7.
Adam Finn, a professor of pediatrics at the University of Bristol, said the "extreme rarity" of the blood-clotting events in the context of the millions of jabs administered in the United Kingdom makes the decision facing people very straightforward.
The Dutch health ministry said that the country "must err on the side of caution" but that the vaccine was "safe" for use.
"Up to and including 24 March, we have received 22 reports of cerebral venous sinus thrombosis (CVST) and 8 reports of other thrombosis events with low platelets, out of a total of 18.1 million doses of COVID-19 Vaccine AstraZeneca given by that date".
The Netherlands on Friday halted vaccinations with the AstraZeneca jab for people under the age of 60 after five new cases among women, one of whom died.
Earlier we spoke to Professor of Public Health Linda Bauld and started by asking her about the relative risks of getting a blood clot from the vaccine.
Dr Fauci provided a dubious answer when asked whether the US Department of Health will use the 300 million doses of AstraZeneca vaccine the US bought previous year.
"I acknowledge that people will be anxious and we will get more information as soon as it's available".