There are many Britains but one is the setting for folk horror with its wild landscape, isolated villages, stone circles, ruined abbeys and, of course, ancient rituals. And no book did more to cement that image in my mind than the AA Illustrated Guide to Britain, published back in 1974, that I used to pore over as a kid.
So I got a kick out of seeing it sitting prominently on display on the bookshelf in the final scenes of Bone Temple.

