It's funny, as I read through comments here, books people mention remind me of others. I read quite a few though by no means all of Malcolm Saville's Lone Pine series. I found tge detail of places and atmosphere in England fascinating. I was deeply intrigued by the Cinque Ports.
Similarly Alderley Edge because of Alan Garner's Weirdstone of Brinsingamen/Moon of Gomrath pair which became a trilogy of sorts many many years later with Boneland, which I read but could not resurrect the fascination with. Amongst Garner's other books was the stonkingly weird and quite disturbing The Owl Service which became a weird TV series. At the time, I was too young to get the story being so involved with developing sexualities of the characters. Ot's also a fabulous gateway into Welsh myths.
Then, of course, there was Ursula Le Guin's Earthsea books which has a brilliant concentration on the idea of balance which has hints of ecological concerns and Eastern thought.