There is a book of West Gallery Stuff called the Mellstock Carols, available through the Serpent Press. Anyone got an address for this outfit? There doesn't seem to be one on the book.Also, check outthe work John Roberts and Tony Barrand have done with Noell Sing We Clear (I never spell this right, but I believe there's material on Sandy Paton's Folk Legacy Website about them)
Masters in this Hall is a good 'un, as is Lo How a Rose. I also have done an interesting pairing with I saw Three Ships and Bring a Torch. The tunes work well together.