My local high-school was also the wider area's sink-school that kids got expelled into from other schools, though there wasn't any way of particularly escaping, should you just happen to be going there anyway. Anyway, the transport arrangements for some of the kids was a nightmare.

edit - also, from my observation, concentrating all the nutters under one roof does not really help, if your aim is educational. It just takes a lot of little problems across a lot of schools and turns them into one big unmanageable problem that can be politely ignored.