It struck me as a book you had almost certainly read.

It has a scary tower that looks like a windmill without sails and they call a silo. I haven't read the book, but I knew that it was adapted from a British novel, and having seen it I guessed that the original was set in Norfolk, so while it may not be adequately East Anglian for an actual East Anglian, it definitely conveys a sense of place. It's absolutely lovely and the cinema audience was enraptured.