Rememberyourhat
So, if I understand you correctly:
Bert has done the wrong thing wrt grammars, because due to where she lives, her DC attended schools in the bipartite system, one of which was a grammar.
I have done the wrong thing because I live in an area far enough away from the residual grammars in a partially-selective system to have the option to send my children to a comprehensive [Snow, it is a comprehensive, pretty much - far enough away from the grammars to be a comprehensive] but have not sent them to a grammar?
In case you think my choice has diminished my influence over the system I wish to change, far from it. Tracking the demographics of the comprehensive - like many schools in partially selective areas its history was as a true secondary modern - there has been a gradual increase in able pupils opting for it rather than the grammar. That in turn, over a significant period, has given a critical mass of such students, and now there is a stable comprehensive intake including the most able. Parents with views like mine, who have opted for the comprehensive rather than the grammar for their able pupils HAVE made a significant difference over time, by gradually creating an ethos where it is the natural local choice for pupils of all abilities. Parents like me sustain and continue that ethos.
Snow, as a primary teacher working within the partially-selective system, i don't particularly recognise your description. I advise - factually and professionally, don't worry - on grammar suitability for a very large number of my pupils each year.