t4nut: "Because the cap was there the catholic and CofE systems were not opening any new schools"
Incorrect. Many CE schools have successfully opened under these rules, some with 100% open admissions. It is only the Catholic education service that is refusing to open schools. That is their choice, but they are using it as a lobbying tactic. Up to now the DfE has refused to give in.
However, the new Government are planning to roll over and do what the Catholic Education Service want.
In removing the cap the reality will be more schools and more choice
Rubbish. There aren't enough surplus places in the system for everyone to have a "choice" because budgets are squeezed more than ever before. It will increase choice for a small minority and reduce the choice for everyone else.
If a new school opens in your town and you can't go to it, that is not increased choice!
catholic schools are usually very diverse
Many are racially diverse, because Catholicisim is an international religion. It is religious diversity that they are lacking. That is important too.
... and only in rare cases fill up on faith grounds
It's not rare in London, or many other places where population growth has led to pressure on school places.