fedda:
Yes, we won an appeal when there were, in fact, 32 already in the class. It was Y1 and not reception, but still KS1 so same applies.
We moved house mid-year and so had already applied and got the place for School A. (We didn't dare be so presumptuous as to go for School B before the house move happened - so easy for these things to fall apart.) After we moved, school A was 2 miles away and we were dependent on a sporadic bus service. We expressed the need to send our child to the local village school, B, and were turned down.
We lost the first appeal and went again as soon as we could.
We had to make a very clear case for the reasons we wanted the nearer school B, rather than negative reasons for not wanting A. I read up on all the DfES regulations and was very clear about all the technicalities.
You have to go into the appeal being very hard-headed and not caring about how pernickety or petty you may appear, or how much you are depending on technicalities - these may win it for you.
Read Ben Rooney's "How To Win Your School Appeal" and speak to the Advisory Centre for Education on 0808 800 5793.
At all times, remember that the Local Education Authority is your enemy, and is trying to stop YOU sending YOUR child to the school YOU want. They will use every trick in the book. So should you.