Preheat the oven to 180C Fan.

To make the filling, melt the butter in a saucepan. Add the apple and peaches and saute for 3 minutes. Add the sugar. Remove from the heat. Add the berries. Spoon into an ovenproof dish.

Mix all of the crumble topping ingredients together in a bowl. Rub in the butter until the mixture looks like coarse breadcrumbs. Scatter over the fruit.

Bake for 25 to 30 minutes until bubbling and golden on top.