Are you thinking about Victoria Hall? When I was at the school we used to to go Victoria Hall not too far from Ruislip Manor Station and I remember Bunces sweet shop nearby in particular. We went there in year l of the junior school. This Hall was demolished about a year ago.

By the boys playground were "The Huts", which when I was there still had the area where the coal was stored by them. I think they were built from Asbestos. There is still an annex there, but more like a portacabin.