Supermarkets have been struggling for a long time with fresh food counters / deli / butchers, and fish. Since the virus its also made it worse with low numbers of customers or erratic numbers, leaving the supermarket unable to cater to any degree, so they've been throwing away more than they've been selling. Tesco's closed all there fresh food counters before the troubles, and the cooked chicken counters. Sainsburys have opted to keep theirs closed at the moment due to lack of demand. Morrison's, they kept closed for a few months then re-opened, but you can see its just lying there for days on end, I wouldn't touch anything they have on display at the moment. The hot counter is a disgrace, but that's the two very near me, can't speak for the rest of them. Also Asda are seeing them gone here and there.