Toss together the fruit, sugar and 2 tablespoons of flour in a large bowl. Transfer the mixture to a shallow baking dish.
Combine oats, flour, brown sugar, butter and oil in a bowl; work the ingredients together with a fork or your fingers until the mixture is crumbly. Stir in the juice until the mixture is evenly moistened.
Distribute the topping mixture evenly over the fruit.
Bake until the fruit is bubbling and the topping is golden, 35 to 40 minutes.
Serve with non fat strained plain yoghurt with a little honey drizzle, or frozen vanilla yoghurt.