Here's the tune for the Lady Maisery et al version. I also think I made a mistake in my original lyrics in line one. I think it's "jaw round the fire", not "draw round the fire".

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%abc-version 2.0
X: 1
T: Sing We All Merrily
M: 3/4
L: 1/4
C: Traditional; Hannah James
Z: Mick Pearce
D: Lady Maisery + Jimmy Aldridge & Sid Goldman: Awake Arise: A Winter Album
I:linebreak $
Q:3/4=61
K: Baeo
C|D F D| B, A, B,|C D C|B,3|$
w: Now, Win-ter is here we will jaw round the fire.
D F D| B, A, B,| C D C|B,3|$
w:Sist-er and broth-er and grand-son and sire.
B A G|F E F| G F E| HC3|$
w: Christ-ians and heath-ens their voi-ces to bring,
B, C D| (E/F/) HG E| F E D| B,3|]
w: Gath-er to-ge--ther, make mer-ry and sing.