Further to Down in Yon Forest/Corpus Christi Carol: having not bothered with carols for a year, I just checked my notes and I first learnt it from DigiTrad in Eb but, finding the fingering difficult, I changed to C when I saw it that way in the "Oxford Christmas Carol Book"; for what it's worth, my fingering has improved a bit and I intend to re-do it in Eb for next year, as that key suits my voice better.
"Christmas Sung Simply"/"As Gospellers Have Said", Smokey, is the very last piece in both my book/website "Walkabouts" and my CD "Chants from Walkabouts" and, again for what it's worth, I've just finished working out/writing the tunes for all 17 Chants, so will probably have an accompanied version of "CSS" ready for next year, also.