Heat oven to 180°C fan and line a loaf tin.
Mix flour and baking powder, then rub in the butter until breadcrumb-like.
Stir in sugar.
Whisk milk, egg, vanilla separately, then gently mix into the dry ingredients to make a soft dough.
Spoon into the tin and bake for 35–40 mins until golden and cooked through.
Cool completely.
Mix icing sugar with enough milk to make a thick icing, spoon over the loaf and cover with sprinkles.
For the custard, warm 400ml milk.
Whisk the remaining 100ml with custard powder and sugar, then whisk into the hot milk until thickened.
Stir in vanilla and the tiniest drop of pink colouring.
Slice thickly and drown in warm custard
