Officially, the boys were divided into four "houses" (yes, like at Hogwarts). However, the physical characteristics of the school made it infeasible to assign boys to dormitories on this basis, so in practice the "houses" didn't correspond to anything in reality. It seemed a meaningless concept and I took little notice of it.
I think the houses were all named after creatures of some sort. One of them was probably the kingfisher, which was a symbol associated with the school for some reason. I think another one was the otter. Perhaps I was one of the Otters; I don't remember now.