Went to Disneyland Paris last weekend, so not only were we wearing masks at airport and on flight, but all the time in the theme parks as well.
30 degree heat made it a bit of a challenge but it beat sitting at home. The measures put in place by Disney were nothing short of superb - plenty of markings on the floor and a monumental level of perspex screens. Almost everybody was wearing a mask (except young children) and social distancing was good.
As I said on another thread, if you are going abroad, make sure you download and complete the UK GOV locator form before you return home. You can do this 48 hours before you return. Had a bit of a chuckle at everybody who hadn't and had to gather in a non socially distant group to fill in their forms and wait in a huge queue, whereas we were through in minutes.