Holidaymakers could be refused entry to popular winter destinations because the NHS app does not show booster jabs, reports say.
The Covid pass within the NHS app currently records first and second vaccinations - but does not recognise third shots.
This is affecting tourist's chances of going abroad, it is said, as some double-jabbed Brits find them passing the so-called 'expiry date'.
This is based on when they received their first two vaccines.
Israel, Austria and Croatia have all set 'expiry dates' - some as low as 180 days after the second jab - for the validity of vaccines.
And it is thought that more countries could adopt the same policy, making it essential to have proof of a third jab when travelling.
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But, until the issue with the Covid pass is fixed, travellers may be forced to rely on other means to go to abroad.
NHSX, which is responsible for the app, believes the error is not due to a glitch but because to a “wider policy” issue, reports say.
Israel bans entry to travellers who cannot provide proof of full vaccination or booster within the past 180 days.
In Austria the cutoff point is 270 days, the same as in Croatia.
However, in the latter travellers can still enter with proof of a negative Covid test in lieu of proof of vaccination.
Israel’s tourist board also told i that a GP letter will be accepted as proof of a booster vaccine dose.
Sharon Bershadsky, Director of UK’s Israel Tourist Office said: "For those wishing to travel to Israel in the coming months, tourists will need either proof of full vaccination in the past 180 days, or a booster jab.
"Whilst the NHS app currently doesn’t show proof of a booster vaccine, travellers can provide any official documentation highlighting their vaccination history as proof of booster vaccine which your GP should be able to provide upon request."
It was also reported on Sunday that British travellers who fail to take their booster jabs could face renewed restrictions.
So far only 60 per cent of those eligible for their third jab have come forward for their booster vaccine.
Reports say that there are plans being drawn up to reimpose quarantine and testing for those who have refused their third vaccine - even if they are double-jabbed.
Measures could be introduced to protect the UK against the spread of new coronavirus variants, it is reported.
Plans would change the definition of fully vaccinated from being double jabbed to being triple jabbed.
A Government source told The Mail on Sunday : "This is not going to happen immediately – but happen it will."
