Ah yes, I watched some of these a while back. Incidentally when i go to that google video link, the related videos on the right also gives me links to the other programmes. (Channel 4 isn't BBC, btw, it's a private channel, but both it and the BBC seem to systematically try to stop their programmes being seen outside the UK. Not sure why, since the marginal cost would surely be very small.)
I remember very mixed feelings about the programmes I saw; some of the children and families seemed very well adjusted, others much less so, and although it seemed that the programme makers were trying to be sensitive I did wonder, for example, about the filmed announcement to one of them of his IQ. Joan Freeman was advisor to the programme and while she's obviously an expert I've had inchoate reservations about her approach for a while: she comes up in the "two year old admitted to MENSA" type news stories and I tend to wonder what benefit she thought there could possibly be to anyone in that kind of stunt... but obviously, without knowing the full facts, it's little more than a feeling on my part. Still, gut feel is that I wouldn't want her having anything to do with my child.