Frustrating but unavoidable!
My DC are secondary school and they have been doing 'in school' lateral flow tests for staff and keyworkers kids since Christmas. When the rest of the children went back it was 3 in school LFTs then home testing.
The rules initially were that if you failed the LFT, you took a PCR and if clear you could go back. Then the kids all started back and the govt changed it so even if you passed the PCR you still had to isolate for ten days. That obviously led to huge complaints from parents (as so many were failing the LFTs then passing the PCRs) so the govt changed it again just before Easter, to say if you failed the LFT you COULD NOT have a PCR as you were deemed positive, end of!
Guess what? DS failed a school LFT and we all had to isolate for 10 days. Not a massive issue, though not ideal as DH only got Statutory covid pay of £95 pw
and kids were off school again - but a big worry for elderly MIL, with whom we had spent mothers day just before the positive test! We weren't even allowed to get LFTs for the rest of the family to try and reassure her! I spent all day on the phone to 119, local council, public health etc but 'them's the rules'! Luckily DH got one from work and passed, so that eased her worry a bit - but a 93 year old living alone, with angina and high blood pressure doesn't need that sort of stress!
Now the children are all doing home tests it's changed again - if you fail the LFT, you get a PCR and if that is clear you can go back to school. This is because the school admin and finance staff are clearly trained medical professionals
who can be relied upon to interpret a LFT result but parents can't. (Or because the government has decided it can't cope with any more complaints.....)
So yes OP - I feel your pain - but I think we just have to suck it up! I'm pretty sure DS didn't have it as none of us got symptoms and I kiss him goodnight and we all cuddle a lot etc - but we will never know! But just in case - I totally accept that it was better to stay home for ten days than risk passing it on. (Just wish it had happened the week before....lol).