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Preheat the oven to 180°c (160 °fan/ Gas 4).
Place the blackberries, sliced apple and caster sugar into a 2 litre pie dish and give them a gentle mix.
Put the plain flour, oats, and light brown sugar in a mixing bowl, and pour over the cooled melted butter. Stir with a spoon until crumbles form.
Spoon the crumble mixture onto the fruit and bake in the oven 45 minutes until golden.