Boris Johnson urged people to speak with rule breakers before notifying authorities.
“I have never been much for the underhand culture, myself,” he said.
“What people should do in the first place is obviously if they are concerned, is to raise it with their friends and neighbors.
“But I think what it’s reasonable for anyone to do is think that their neighbors’ activities pose a serious threat to public health – if there’s some big sort of Animal House party, like I’m sure hot tubs and so on, and there’s a serious threat to public health so it’s reasonable for the authorities to know. “