Britain is moving towards offering everyone a COVID-19 booster vaccine, a member of Britain's vaccine advisory committee said on Monday, ahead of an expected decision on whether to extend and speed up booster shots.

"Inevitably, everybody will be offered a booster," Anthony Harnden, deputy chair of the Joint Committee on Vaccination and Immunisation (JCVI), told BBC TV.

"But what we want to do is make sure that it's done in a sensible order so that those that are most vulnerable for this infection can get boosted and their natural immunity levels can go up."