Vaguely remember reading a series of books set in a girls' boarding school which were probably written and set in the late 70s. Can't remember much apart from someone playing Abba records and possibly one of the characters had a name beginning with V. They were books I borrowed from the library and were fairly thick hardbacks I think. I don't think it was Trebizon or Antonia Forest as I don't think I ever read any of these. Other books which I know I read were set earlier, such as Dimsie books.