my question was for several reasons:
1: yes many parents do see 'school age' as the time to go back to work, so delaying it until 6 would impact on people's ability to work unless it was replaced with a contiuation of preschool/ reception type arrangements. You may not like that women (and men) often go back to work when their kids are 4/ and starting school but it is a fact that they do.
2: My DS (and I'm sure plenty of others) thouroughly enjoyed and benefited from a slightly more structured approach with his age peers from around 3yrs onwards. His temper tantrums got less, he leanrt lots fo skills because he wanted to be like his friends, he became more confident. I couldn't have provided that at home (I'm not at all good at the idea of home ed) so unless he had free preschool and reception he would have missed out on that.
3: My DS is a very social and independant soul and gets bored at home with mom, so again without 'some' form of state provided free early learning/childcare from 3-6 hr would be bored and frustrated.
I think fallenmadonna has a good point, are we all talking about the same thing when we say 'school'?
As I said DS reception year seems to consist of lots and lots of play, lots of outdoor time, lots of exploration, lots of social stuff and a little bt of learning how to write their name, say the alphabet and count to 10. No homework unless you count the school reading book whih comes home and you are asked to read it once or twice a week with them. I dont' think those are unreasonable goals for 4-5yr olds.
tbh looking at the yr 1 claas, althoug they spend more time in formal learning situations last week I spotted Yr 1 (5-6):
on a walk round the village to look at the frost patterns on the field/church etc
joining in with the reception and Yr2 for a big game of british bulldog when the rain let up one afternoon - teacher reasons for abandoning plans? they've been cooped up too much this week
helping the school cook choose the veg from the garden for lunch
helping the younger ones get into their costumes for the nativity rehersal
singing
doing a huge collage about Xmas all around the world.
where are these schools that get conjured up where children are sat at desks all day long at the tender age of 4 or 5? Never seen it here.