If you like folk music these are great albums.
A Tapestry of Carols (Saydisc 1986 CD-SDL 366)
Carols and Capers (Park Records 1991 PRKCD9)
Carols at Christmas (Park Records 1996 PRKCD45) [Live]
Gold Frankincense and Myrrh (Park Records 2001 PRKCD59)
An Evening of Carols and Capers (Park Records 2005 DVD PRKDVD87, CD PRKCD86) [Live]
Ringing the Changes (Park Records 2007 PRKCD98)
Vaughan Williams Carols Songs & Hymns (Park Records 2010 PRKCD111) [Not all Christmas music]
A Christmas Caper: The Best of Maddy Prior & the Carnival Band (Park Records 2012 PRKCD124)
English Folk Carols (Regis Records nd RRC1335) [Also featuring one track by Sneak's Noyes]