Just wanted to say in my ds's London Catholic Primary school, in his class one third are black, one third mixed race (ie Asian, Sout American etc) white (either British, Polish or Irish) and it's perfect. Far better than the non denominational schools.
icescreamsoup, you're obviously not pleased about 'religious segregation, but I have to say, I think you're going about this the wrong way.
What I really like to see across all schools - including grammar and private schools (haha, yeh in my dreams) is them taking their fair share of people in poverty. That wouldn't be hard to implement, and there would be far less opposition from churches who own the bricks and mortar of the school, and it would be less expensive. It's about 15 - 20% of kids on free school meals - so each school has to have a percentage of places held for kids on fsm.
Also, I think your information isn't quite right. Anyone with a statement goes straight to the top of the list of any school RC included, as does looked after and adopted children, as I understand it?
I looked round the London Oratory and heard the headmaster telling a Muslim mother whose child had a statement this.