Someone I know went out with a large group of people last weekend and found out that several have now tested positive. Said person was not only with "person zero" last weekend but has seen the others mid week (who tested positive the day after being with them)
They are just carrying on socialising as normal, have done LFTs but is refusing to get a pcr. I just couldn't do that, knowing I've had close contact with positive cases - everyone in the group is vaccinated, so no, isolating isn't required but I'd expect a bit of common sense?