Lots of posts - I'll try to answer them - this is helping, thanks!
DS1's doing well at preschool - he's "quietly confident" now, which is great. If he goes to school nursery this September, he'll be there over a year - he doesn't start school till January 2009 (I'm not sure why he's been a Sep intake for the nursery - I can only imagine there was a space for him - as round here a lot of schools have an end of Feb birthday cut-off for Sep admission).
LIZS, he won't start reception till January 2009, so he'll have a year at school nursery, rather than a year and a term. He'll have another term at preschool too, which I think will be a gradual transition for him.
HG, that's how I felt - he'll never have these school-free days again and I think they're precious - I hadn't realised how much I felt like that till I realised there weren't many left if he went in September.
Colditz, he'll just go to preschool another morning a week if he gets an energy surge. And I'll get a hamster wheel or something for the garden
Twiglett, DN is a month younger. If they alter the sessions so that they both do afternoons (so DN can start with his fellow littlies), then DS1 will have his friends going to mornings and he'll be put with new children who are settling in, which is a bit pointless for the sake of starting him in September if he doesn't have to, I think.
Looks like I've made my mind up, haven't I! Thanks for helping