Stephen Gray's definition: "Folk horror is a sub-genre of horror fiction (or of Occult fiction in WorldCat Genre terms) characterised by reference to European, pagan traditions. Stories typically involve standing stone circles, earthworks, elaborate rituals or nature deities. While the genre is not overtly concerned with Christian ideology, frequently used terms such as 'demon' and 'devil' appear to associate folk horror with Christian demonology..." See his FolkHorror.com site for more. ** It also includes recent/modern and non-British works that draw on the same tropes. It is a list-in-progress, so suggestions are welcome!