Nice try Sheikh ,but the RCPCH didn't say there were zero CEV children in England and Wales but that the CMOs had decided that they will no longer be seen as CEV for the purposes of shielding .
The RCPCH is the is a professional body for paediatricians ,they were updating their profession on a decision made by the government's CMOs .
They didn't make the decision ,they were passing information on .
The RCPCH say that there are a very small number of children and young people with severely compromised immune systems who are more vulnerable than the rest of the population to being very unwell from all infections, including SARS-CoV-2. They report that rather than shielding ,the CMOs were asking paediatricians to provide advice on a case by case basis to those children.
To be clear they don't say there are no CEV children in England and Wales -you chose to say that and to base your argument on that belief .
Ok, so let’s say we fit air filtration systems in all classrooms.
There are 0 clinically extremely vulnerable DC in the UK, so there is no benefit whatsoever to health outcomes for any DC whatsoever.
No one in their right mind would believe that there were no CEV children in the UK ,it says a lot to me about how you formulate your arguments that you should choose to believe this without thinking about the distinction between their removal from a shielding list and their existence .