Yes, Maddy Prior and the Carnival Band - "Carols and Capers" - is superb, as is the "Bah Humbug" album with contributions of "alternative" seasonal songs from many different sources. Another favourite of mine is Bill Barclay's very alcoholic version of the 12 days of Christmas!
Track list:
Intro: The Bells, the Bells! (0.24)
Eric Bogle: Santa Bloody Claus (4.02)
Tom Lehrer: Christmas Carol (2.41)
Cyril Tawney: There Are No Lights on Our Christmas Tree (4.47)
Robin Laing: The Man That Slits the Turkeys Throats at Christmas (5.18)
Tom Clelland: The Present (4.59)
Bill Barclay: The Twelve Days of Christmas (Roud 68; G/D 3:637) (4.24)
His Worship and The Pig: Mary Christmas (3.12)
The McCalmans: God Bless the Birthday Boy (3.19)
Enoch Kent: Christmas Comes But Once a Year (2.19)
from: Revival in Britain Volume 1 (Folkways FW 8728, 1962)
Loudon Wainwright III: Christmas Morning (3.37)
Cyril Tawney: The Lone Shepherd (7.37)
Greentrax Choir (Drinkers Drouth, Sangsters and The McCalmans): We Wish You a Merry Christmas (Roud 230) (3.03)

Barbara Dickson did a very nice album simply called "Winter": here's the track list:
01. Winter's Come

02. Let All Mortal Flesh Keep Silence

03. In the Bleak Midwinter

04. Creator of the Stars of Night

05. The Angel Gabriel From Heaven Came

06. Of the Father's Love Begotten

07. The Silence of the Dawn

08. The January Man

09. O Come, O Come Emmanuel

10. My Song is Love Unknown

11. Winter Song