Combine flour, baking powder, salt, sugar and suet in a large mixing bowl. Work suet into dry ingredients with fingertips. Mix in enough water (6 to 8 tablespoons) with a fork to make dough leave sides of the bowl.
Roll dough into an oblong about 12 by 18 inches. Spread with apricot jam and roll lengthwise into a large sausage shape. Seal edge with water and fold ends like an envelope.
Place on a large buttered baking tin and bake in a fairly hot oven (425°F-M6) for 20 to 30 minutes, or until golden. Serve warm with Custard Sauce or whipped cream.