It's funny my Dad and I were just reciting the version he was taught and passed on to my brother and me 30 years ago.

Twas Christmas In the workhouse
The pudding was piping hot
It was for the old age pensioners
The greedy F***in lot.
In strolled the workhouse master
who surveyed the grimy walls,
turned to the old age pensioners and
bellowed Merry Xmas one and all.
One sprightly old age pensioner
with balls as bold as brass
shouted we don't want your xmas pudding
Stick it up your Arse