Should probably take them but don't, because the false-positive rate is too high; though I can WFH, partner can't and wouldn't get paid if he had to isolate with me. OTOH we've both had our full set of jabs and I have taken the PCR tests whenever the Zoe app asks me to; several times so far because of my hay fever, and all resolutely negative. If we were in an area of high covid risk I would regularly do the tests, but we're not - I only know one local person who got it, and that was back in January. It helps to live in a bit of a backwater!