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@Chalfie
This is where I scratch my head, look at my updating power BI, wonder why it's taking so long.
The false negatives (or undeclared positive results - which could happen I suppose) and also the not great performance in Liverpool (https://www.bmj.com/content/371/bmj.m4848) are something I (personal) am concerned about. Not in a "oooh, I know so much more", as tbh, I don't. I've not looked at this too much in the last week or more.
If the accuracy and the detection rate is low, it's not just kids at school that'll be affected. If the idea of using schoolkids as the canaries, then having low detection rates/accuracy when the circulating population of the virus is low sounds like it might be a problem. Because you'd want to do something when it's low and not when everything is hotting up.
I think that's how it works. I am tired though.