@Prezperez - Yes we have had this happen twice at school with LFTs picking it up late and had 16 out of 18 staff go down with it. We had to shut the school and the kids had to stay at the residential home but then it got into the home as well as the residential staff started to become ill. Bloody nightmare.
At the end of the day we can only do so much but at least we try and all this bloody patronising why are you still testing really annoys me. We had someone catch Covid over the last school holidays and because he tested before he came back he was able to stay off for a few more days to make sure he was clear.