Mix the flour, currants and grated suet (it should have the general consistency of mouse droppings) very lightly by hand.
Moisten with a couple of tablespoons of cold water, enough to give a dryish pastry texture.
DO NOT RUB, only stir enough to bind the ingredients together.
The mixture can be put into a buttered basin and covered with first a layer of foil, then a cloth (tied on with string), but the usual way is to make a thick roll shape, and wrap it in buttered greaseproof (waxed?) paper, and tie into a cloth.
Boil in a lot of water for two to three hours on top of the stove, or all day if using a crock pot.
To serve, slice it into 1" thick chunks while still hot.
Some people serve it with egg custard, but others consider serving spotted dick with moist brown sugar and a large spoonful of salted butter a must.