Preheat the oven to 180°c (160 fan/ Gas 4) and grease an ovenproof baking dish.
In a jug whisk together the ready-made custard, milk, and vanilla extract.
400 ml Custard, 200 ml Whole Milk, 1 teaspoon Vanilla Extract
Slice the hot cross buns in half with a bread knife and butter both sides of the hot cross bun halves. Sprinkle over the raisins (reserving a tablespoon for the top of the pudding) before sandwiching the hot cross buns back together.
6 Hot Cross Buns, 2 tablespoon Butter, 50 g Raisins
Place the hot cross buns in a baking dish (about 2 litre capacity).
Pour over custard mixture and sprinkle on the reserved raisins.
Bake in a preheated oven for 25-30 minutes or until golden brown and bubbling.
Sprinkle with chocolate chips, more raisins and dust with icing sugar if desired.