Millions of people could have to get a booster jab to keep their Covid vaccine passport up to date, the Health Secretary has said.
Sajid Javid said "I can't rule out" changing the definition of fully-vaccinated from two doses to three, for people who are eligible.
That would have a knock-on effect on vaccine passports, which are already needed for travel, and could be brought in at a week's notice in England's nightclubs and large venues this winter.
It comes after France announced over-65s will need to show proof of a booster from mid-December to keep their health pass valid - allowing access to restaurants, trains and planes.
The debate about the definition of fully-jabbed is ongoing in the UK, as over-50s and the vulnerable are being offered a booster.
Asked if he would "look at" the same approach as France, Health Secretary Mr Javid told Sky News: "We’re not looking at that yet".
He added: "We're very focused on our booster programme, as you would imagine…
"In due course we will have to look at what constitutes vaccination.
"But at this point the most important thing is anyone who’s eligible gets out there and gets their booster."
Asked if a France-like change could potentially happen in the future he said: "I can’t rule that out.
"And we know now that the vaccines do wane and it’s important that those vaccines, where necessary, those people get a top-up. And that’s what the booster programme is about.
"But I think that’s something we have to keep under review."
