Apologies for not replying sooner - I think the vast majority of people involved in this debate have highly entrenched views that aren't going to be changed by some internet discussion on it but I will add a few points.
My main issue is that the Council (i.e., a relatively independent body) should carry out an assessment of where school places are needed in the Borough rather than respond to a particular group of parents who, understandably, are keen for their children to have the best opportunities.
In response to JulianTennisCoach, I think many of the comments on this thread enable people to draw their own conclusions about the motivations of the affluent parents of Northcote. I understand that not everyone in this area is mega-affluent but it is clearly one of the most affluent parts of Wandsworth and Honeywell and Belleville have % of children receiving free school meals vastly below the Wandsworth average.
Someone asked about Burntwood, a great question - girls who lived up to 3.2 miles away secured places last year so that should make things easy for any Northcote residents interested in gaining places.
Of course not everyone from Northcote could attend CG but it is telling that so few do (at 6, this is 1% of secondary age kids) as it demonstrates the lack of support for local schools. And, there is no doubt that a considerable number could get in if they applied. I presume some children in Northcote may have talents in the specialist subjects so I would not discount those places from being within reach as previous posters have. If local people do not want to support this school, they are welcome to seek alternative options as they do currently, no-one would deny them that choice.
It is a question of priorities. Creating a secondary school in this area will create more choice for the people that live here only - on average, the affluent few in our Borough many of whom already have more choice than many parents in Wandsworth due to their affluence. It will enable the continuing segregation of affluent pupils from Northcote from existing, more mixed local secondary schools in response to a campaign led by affluent parents from this area and NOT on analysis of where we need school places overall. I believe that this should not be a priority - the Council should be focused on ensuring there is high quality provision for every child in Wandsworth (with new schools created where needed to enable this).