I read loads of these books but I think I must have got them out of the library because no on in my family knows what I'm talking about. I've asked people over the years and they don't either so I'm hoping the Power of MN can help me out!
I read them in the mid 70s but got the impression they were written in the 30s/40s/50s? There were 3 or 4 kids, they went to the Lake District on their holidays and were pretty much left to their own devices and used to go off walking and stay overnight on the mountain (in tents/bivvys?). I remember that the youngest child always was in charge of making the hard boiled eggs because she used to forget about them and so they were great because they were properly hard boiled. Think the kids were quite posh and went to boarding school. Seem to remember a housekeeper. And possibly a turret room but that's very vague.
Any ideas? Ta