Not How You Make a Plum Pudding
The movie shows the plum pudding as a custardy type of thing. In reality a plum pudding is more of a cake like affair. It is made up of bread crumbs, fruit, including apples, raisins, currants, prunes (plums), suet, and other good stuff. It is made up about a month before Christmas, and stored in the fridge. It should be seasoned with a little brandy or rum. On Christmas day you add some eggs, a little Guiness, and steam it for six hours in a plum pudding mold. You can flame it with a little brandy and sugar. Serve with brandy butter.
It sounds terribly alcoholic, but the alcohol is boiled off, and if it's flamed, the alcohol is literally burned off.
I used the recipe in the original Larousse Gastronomique for many years, but ultimately I was the only one left to eat it, so now I just buy one in the store.