I know Mumsnet loves a "name that book" thread, so I'm hoping this passes muster!
Book read in secondary school (around 2000) I think, as part of the curriculum (but I could be wrong). Could also actually be a play and not a book. I know I'm useless.
It's set, at least partly, in a boys school. Possibly a boarding school. One of the 'house masters' lives locally or onsite with his wife. Feels like it's set mid 50s, or possibly even written then. The house masters wife describes one of the boys a a Lamby (as in little lamb). I think there's a school play in it.
That's it. That's all I can remember 😅 good luck!