The wikipedia entry above pointed to this
recipe for British Christmas Plum Pudding.
Judging from the ingredients, that sounds closer to what we call FruitCake over here. Lots of dried fruits, held together by a very little bit of sweet bread batter. Frequently doused with alcohol.
"Pudding" over here (perhaps helped along by the jello brand people) now means a milk, sugar, flavoring mixture -- brought to a boil, and then cooled to a jell. Or to a custard -- but not the thin stuff that the UK pours over desserts. (Or did in '76 when I had a full summer over there)