UK has a lot more cases of Coronavirus per capita than we do, over 400 at last count. The ban is also not applicable to Romania, Croatia and Bulgaria, all of which have a lot of cases already.
Plus any European can fly through UK and come here without restrictions.
I am sure it is pure coincidence that there are 3 major golf resorts in the UK that belong to Trump. So if anyone has any plausible reason for this quirk, it would be nice to hear.