Ugh, I bet they've done this now, before the students go back.
It might stop massive pub crawls but what's to stop 2 groups of 6 "accidentally" bumping into each other in the pub & shouting across to each other?
The police have the resources to drive round the neighbourhood looking for lots of cars parked outside a house, do they?
I'm not advocating people spread the virus, but those who are determined to carry on with socialising in big groups, will.
Those of us who get our kicks from things like knit & knatter classes, choirs & coffee mornings don't matter.