Likewise - we were also told that this was a done deal (to the point of being talked through the timing of the development). Maybe different people got different messages on different days.

Completely agree that legal action should only ever be a last resort, and the first thing is for the Council to explain why they have taken this decision. It is also they - not the school - who would be a party to any action, addressing the divisiveness point. But whenever any public authority - from Lewisham Council to Jeremy Hunt - acts in an arbitrary or unfair way, we have the right to call them to account.