Many Americans are heading back the US I read today and I can only image many Brits will be considering it, if Germany continues to lag many months behind. I wouldn't say it is really the right thing to do but it must be easy enough to re-register with a GP. Maybe when most of the UK is vaccinated and has some vaccines left over, then it is fair game. I think the risk of flying now is negible. Despite the 1000s flying every day, few cases are reported from planes.