A Cold Season by Alison Littlewood.
Disclaimer...I bought it in Smith's on a buy one get one half price, and grabbed it as the cover looked good.
It's about a mother and son marooned in a small Lancashire village with unfriendly locals...a bit Wicker Man-ish. And of course there are witch/devil undertones.
It is utter tripe.
It is now in the charity shop for some poor sod to buy.