That is so so annoying! My daughter had a raised temp every time she cut a tooth, it’s a thing.
I don’t think you can blame the nursery though, what else can they do? They can’t make a judgement between what’s a covid temp and what’s a teething temp, no one can, all they can do is follow the guidelines, which they did.
The issue is, who pays for this annoying problem? You, or the nursery? If they rent the building and pay staff etc they’d quickly go bankrupt if they give discounts to parents every time a child has a temp/cough.
So it falls on you to pay, which isn’t fair either, except in the sense that you chose to send him to nursery knowing that there’s a pandemic on and that he would sometimes be sent home with temperatures, and you should have known the nursery policy on fees / lateral flow vs pcr test already. (I wouldn’t give a pcr test to a toddler who’s asymptomatic either).
So yabu to be annoyed with the nursery but yanbu to be pissed off that covid is costing you money, it’s cost us all a lot of £. The pandemic sucks.
That said if they never told you that they’d insist ona pcr test then yanbu - but I think they’re just following the guidelines I’ve heard this is a problem in schools too.