No surprise to me. I was in the UK last month and it was quite hot and sunny for a while too. I'm Australian so out of habit just put on sunscreen all the time and kept reapplying occasionally while out.
I didn't see a single other person using sunscreen. But saw a lot of lobster red faces and necks. In fact people seemed to go out of their way to expose as much skin as possible to get burnt.
As an Australian I see alot if overseas backpackers doing farm work over here. It is shocking to see these folks getting pretty bad suntans and not respecting the Australian sun.
I wonder if there will be a sharp rise between those that came here in about 20yrs