Beds at Cefn Lea come with a light duvet, and pillow. The rooms are warm and nobody last year told us they were cold.
You can either bring your own duvet cover, bottom sheet, pillowcase, and towel, or you can rent a pack per bed from Cefn Lea. The pack contains 2 sheets (not a duvet cover), pillowcase and a towel. Its worth considering renting if you will be coming by public transport and want to keep the weight down.