You're getting mixed up here, and making it harder for yourself. To clarify, the 30k figure comes from the ONS data.
You commented:
To which I asked:
I.e - why is the surveillance report flawed?
To which you respond referencing the ONS report is flawed, not the Surveillance report from PHE.
Back to your point:
If you're looking at the absolute numbers of the data then yes, but the practicality of society having one section of education open, and the other closed, probably causes more challenges to parents than providing a solution. Back to the very original point in this discussion two weeks ago now, it was about educational settings being the elephant in the room at the minute. The government and general public consensus is that pubs/restaurant settings are the challenge for the spread of this virus, and the argument back then was that the elephant in the room that everyone is ignoring and not mentioning is that the education settings are a large contributor to what we're seeing in the UK right now. In reality, which we've seen so far, the 10pm curfew on pubs has done little to reduce case numbers, and has acted as a bit of a window dressing.