Just a brief point on Bertrand.
She objects to the selective system. So, obviously, she objects both to grammars AND secondary moderns, because BOTH are part of that system.
However, she has to live where she lives, and thus has to send BOTH her children to schools she would rather didn't exist, and objects equally to their existence.
It is no more inconsistent to send one child to the grammar part of the system, than it is to send one child to the secondary modern - neither, in her view, should exist, and she would prefer to send neither child to either.
To me, that is completely consistent with her expressed views, because she objects to the segregated SYSTEM, not one part of it or other.
I have often said on these threads, by the way, that I would have no objection whatever to a 'special school' system for the exceptionally able who are so rare that they cannot be effectively educated in a comprehensive system, in the same way as there are special schools for those whose level of difficulty or disability is so rare that they cannot be educated efficiently in a comprehensive system. The percentage of children currently educated at special schools is about 3%, but that is obviously for a range of disabilities and SEN, not just 'low academic ability'. Perhaps 0.5 - 1% max of children might fall into this 'special educational' need of being exceptionally able. They should be identified inexactly the same was as pupils for special schools - not on basis of family income or coaching or school of origin, but on the basis of ed psych reports. In my ideal world, like certain special schools, they would be co-located with large secondaries, so that for subjects outside their special abilities, they could attend appropriate lessons in the 'mainstream' school.
I just don't believe that, in Kent, 25% of children can't effectively be educated in a comprehensive. 1% - yes perhaps. A quarter? No.