OK have read the thread now.
Daisybo, of course if you plan Home Ed then it's another story altogether.
BUT if you are going to send him to school, whatever we may think about the rights and wrongs of sending children full-time at 4, that is what we do in this country. Personally I think it helps children if they have some pre-school experience, rather than being flung straight in to full-time school with one teacher and 30 kids.
Yes, years ago there was no pre-school, I didn't do any, but it's there now, and worth taking advantage of IMO. Also most of the other kids will have done it. Our figure of 11 out of 80 having none is extraordinarily high.
Any good nursery will let you stay with him for as many sessions as you and he need to (ours certainly does) and withdraw gradulally etc etc. Why not go and have a chat to them? A
And yes, I do think you are communicating your anxieties to him, quite understandably. I would try hard to make this a really positive experience for him and I have no doubt he will love it.
In terms of children at our school, the one or two in the class I help in that I am thinking of are still behind - getting better tho. But it's almost the end of the year, and they have spent all that time (IMO only ) trying to learn how to behave in a group when they could have been learning to read and write like the others.