Alisonrose, your post echoes my thoughts so exactly! My DS is August born and will start reception this September. I have always worried that he won't be ready and I hate the fact that the system is so inflexible.
He is verbally like a child a couple of years older, which I know will help him, but in lots of ways he's still a toddler - he just doesn't want to dress himself for instance no matter how I try to encourage him. And he isn;t brilliant with a knife and fork at all!
I know people say they adapt and learn pretty quick but why should there be this hurry? It wouldn't harm him to have one more year first!
I have read on MN one post that haunts me, from a mum whose summer born son started in reception and really went downhill, his confidence took a blow that she felt he has still not recovered from. None of us wants that for our kids obviously!
If it helps Alisonrose, my approach is going to be to bear in mind that legally children do not have to take up education until the start of the term FOLLOWING their 5th birthday - so my DS shall start part-time, and although locally the accepted way is for them to go full time from January, if I feel that he isn't ready then I'll just keep him part time for as long as it takes. That way, I figure that he gets to be part of the reception year but still has a more 'preschool' type level of schooling and legally I don't think anyone could have a problem with this as it's not a legal requirement for him to be at school anyway!!
Here's hoping our DS's are fine with it all and we're worrying for nothing.