This is an intelligent man who has been careful about following rules, and has been doing daily LFTs. Just realised while he was eating breakfast and said 'This doesn't taste of anything.' I said
and he said, 'Oh, the first time I noticed it was Wednesday when x didn't taste of anything.' He just hadn't connected the dots? Booking a PCR now before we go and spend a week with my elderly parents and diabetic SIL.