More than 15 million people have been vaccinated in the UK so far. They have received a record card, while the immunisation has gone on their medical record.
It’s been argued that a vaccine passport or certificate could allow people to prove their status when they travel abroad.
There has also been debate on whether it could be used as an ID to enable people to resume normal life at home, for instance entering a shop or restaurant, or getting a job.

Covid_ Will I need a vaccine passport to go on holiday_ – BBC News