Fortunately I holiday in the UK (which is now known as a 'Staycation' for some reason

), so it's just a case of get in the car and go.
When it comes to commercial flight, I wouldn't be overly surprised if there was some sort of quarantine period (maybe not as severe as it is at the moment) or quick Covid testing on return flights for at least the next couple of years. As for flights leaving the UK...who knows?
What worries me more than anything isn't so much the testing - it's the issue of eroding people's privacy.