Butter each slice of bread and cut into triangles. It is up to you if you leave the crusts on or not.
Arrange a layer of bread, buttered-side up, in the bottom of the dish, and then sprinkle a layer of sultanas.
Keep a dessertspoon of the sugar to one side then sprinkle a little of the remaining sugar over the top of the layer of bread.
Repeat this process with the remaining bread, sultanas, and sugar until all have been used up. Don’t put sultanas on the top layer as they will burn easily.
Beat the eggs together in a separate bowl and add the milk and cream.
Pour this mixture over the bread and sprinkle with a little nutmeg and then the sugar that you put to one side.
Leave to stand for 30 minutes at room temperature.
Preheat the oven to 180C/Gas 4.
Place the dish into the oven and bake for 30-40 minutes, or until the custard has set and the top is golden brown.