Chatting to my accountant today. His wife has to have regular tests on account of her job. Last Saturday three successive Lateral Flow tests showed positive so she arranged a PCR test which came back negative. He has tested negative all throughout using the Lateral Flow tests.
There is something about his Mrs that is causing positive results despite not being infected, no symptoms, nothing. Meanwhile whole classrooms are sent home because a couple of kids have got sniffles (not my words).