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Cut each of the croissants in half, then arrange them roughly, overlapping them slightly, in a deep medium baking dish about 20 x 20cm.
Heat oven to 180C/160C fan/ gas 4. Nestle the blueberries around the croissants and dollop over teaspoons of the remaining lemon curd. Bake for 35-40 mins or until the top is golden brown. Rest for 10 mins before dusting with icing sugar, if you like.