arrrgh, I posted a reply which has gone awol!
Right. This is a summary.
I started off by saying that I do think HE people can be rather touchy on here.
I also think it's a tad patronising to assume Gil is not aware of autonomous ed. etc.
however by dint of the fact that she has been a tutor for some HE families (sorry, Gil, talking about you as a 'she') suggests that such families might be in a particular HE 'camp' (emphasis on suggests) and therefore her experience may not be so much of the more autonomous HE-ers (however, I do accept that she is aware of autonomous ed as a concept).
I did pick up on the point about a parent not being able to offer as much as the ed. system - however, not all children have one parent and indeed, HE parents may spread their knowledge around (i.e. running workshops at HE meets).
The socialisation question is such a doozie - turns up every time. I've already highlighted our experiences and the fact that my elder two have since gone to school and had little difficulty fitting in (even though my eldest is dx. Aspergers and therefore has some support).
Obviously, I have older children and therefore my experience of HE is practical and my experience of HE & socialisation isn't a negative one (if anything it's the other way around in that initially the boys' experience of school was negative).
I still don't think it is necessary to have 10 GCSEs though or, in fact, GCSEs at all