Jam Roly-Poly
A self-raising flour and *suet mix dough, rolled out flat into a rectangle, spread with jam, rolled up and baked. Winter comfort food.
A steamed pudding with currants (the "spots"). Google gave me two main variants of the basic pudding recipe - either a sponge pudding made of flour, butter and eggs, or a suet pudding with flour, suet and milk.
Bread-and-Butter Pudding
Slices of buttered bread, layered in a dish with sugar and dried fruit. A milk and egg batter is poured over the top and soaks the bread. When baked it sets into a yummy, sweet, soft, fruity pudding. My favourite! Best served with cream.
Another steamed pudding made of flour, eggs, butter and sugar. The "treacle" part is golden syrup (light corn syrup?) put into the bottom of the bowl before the pudding mixture is added. When the pudding is turned out of the bowl for serving, the hot gooey syrup mixture runs down the sides and soaks into the sponge. Another variation is jam sponge, with the syrup replaced by strawberry or raspberry jam.
Custard
Properly speaking, custard is a dessert or sauce made from milk, egg yolks and sugar. In practice, what most people think of as custard is a cornflour thickened yellow sauce made from "custard powder" and milk, or bought ready made in tins or cartons. According to Wikipedia 45% of custard sold in the UK is accounted for by the Bird's brand. Comfort food puddings like sponges and roly-poly should always be served with custard. It is, however, important that the custard has no lumps. Lumpy custard served as part of school meals has traumatised generations of English children.
*Suet ... is one of those things that is hard to translate as I don't think there is any American equivalent. Imagine little pieces of fat the size of grains of rice, rolled in flour. Originally made of beef fat, you can now get vegetable fat versions too. It was often used in English cooking as a filler for those on a tight budget - plenty of calories for little money. Suet pastry can be both sweet and savoury, and it is also used to make dumplings.