I realise not everyone is aware of this but you can now accept a reception place and not send your child till the term after they are five - or the summer term if they have a summer birthday - and the school is obliged th keep the place for them.
This came into effect for this year's intake though it was put through very quietly and schools aren't all aware of it either afaik - well our HT professed ignorance, anyway.
I'm not sure yet whether ds2 will be ready or not in September - he's four in June.
I wondered if anyone else is thinking of deferring? I think it should be better publicised that this is an option as so many kids aren't quite ready in September, but might well be fine by Easter next year.
Preschool has said it's absolutely fine to keep sending him there till he starts school.