This is a real treat and certainly not one for anyone counting the calories. This cheesecake requires no baking and the combination of sweet white chocolate and blueberries is superb. Use the best quality white chocolate you can get your hands on, and although I suggest blueberries here, strawberries make an equally nice alternative. Bash the biscuits in a resealable bag with a rolling pin, or any other blunt instrument you can do serious damage with, until you have fine crumbs.

Melt the butter in a large saucepan then add the biscuit crumbs and mix to combine. Tip the butter and biscuit mix into the base of the springform tin and press down with the back of a spoon. Cover this and place in the fridge to chill while you prepare the rest of the ingredients.

Place the chocolate in a heatproof bowl then set it over a small saucepan of barely simmering water, making sure the base of the bowl does not touch the water, and gently melt the chocolate, stirring occasionally.

Beat the cream cheese, cream and mascarpone in a large bowl with a wooden spoon until well combined. Stir through the white chocolate and lastly fold in the blueberries. Spread the mixture evenly over the top of the biscuit base, then cover and place in the fridge to chill and set for at least two to three hours. Remove the cheesecake from the tin and serve.