Preheat oven to 400F and grease a 2 pint ovenproof baking dish.
Butter each slice of bread with the butter (on either one side or both as you wish). If you prefer, you can remove the crusts from the bread slices, but this is easiest done after buttering.
Line the baking dish with about a third of the bread (butter side down) and sprinkle with half the orange juice and rind. Add half the dried fruit and sprinkle on one third of the sugar.
Repeat with another layer of bread, the rest of the orange and the fruit and another half of the remaining sugar. Place a final layer of bread (butter side up) and sprinkle with the remaining sugar.
Beat the eggs together and add the milk and pour over the top of the bread. Scatter cinnamon or nutmeg over the top.
Bake in the oven for about 30 minutes – until well-risen and set. Serve hot on its own, or with yet more custard!