Geoff: You might be interested to know about this book.
The Joy of Christmas: Words and Music of Traditional & Local Carols. Compiled and Presented by Worrall Male Voice Choir. (published 1982, but name of publisher not given.
Containing 90 pages of local carols, both words and music, it is one of the most comprehensive collections that I have come across. My favourite in the collection is The Mistletoe Bough. I have no idea how we came by the book, but Chris recalls we had it from new.