It depends what their intake policy is - they may take SEN/Looked after children first, then siblings, then church goers etc. That may almost fill their allocation. I've got no idea, I'm just speculating by the way!
They may be able to tell you what happens now, but that's no guarantee that it will be the same in 3 years time.
Sorry can't help you with your question but it brought back happy memories because I lived in Redlake Road and all the mummies used to pick up their kids from outside our house. Never seen Pedmore mentioned on a forum before! We used to go to their school fete and it always seemed very well run.