Sorry, I'm not dismissing any concerns of parents Greeneyedgirl. I assumed you meant some kind of facebook support group but now you explain about the UCL study, although only a small number, that is different. I am in a NCDS cohort, 28,000 of us, who are being questioned and monitored during Covid, but it usually takes a while before they report back to us on their findings.
I agree it is important to be careful, the next step as far as school children is concerned is to implement the proposed daily tests and just remove any child who is infected, not the entire year group. That way, there will be no need for bubbles either.
That seems fine for secondary schools, but my experience of younger children is that this daily testing would be almost impossible to carry out efficiently and sympathetically in primary schools.
So there will always be a fair number of asymptomatic infected kids floating about in schools and in the community.