Re:
Returned this weekend.
Spain doesn't allow anyone not flying into the airport except for staff of course. I filled in my online form for the UK and received a QR code by email to present on entry at Manchester Airport. Got off the plane, through customs and straight out to a taxi. No one is checking you on arrival for covid information, it's just like nothing has changed!
On the route home and observing people, very few masks and no apparent social distancing seen. Now sat at home for 14 days.
Manchester Airport allows none flying public inside the terminals.
Felt much safer in Spain to be honest.