Preheat oven to 160 C / Gas 3. Grease a cheesecake or tart tin and dust with flour.
Crumble biscuits and place in a food processor. Mix with melted butter until the mixture resembles sand. Press into the bottom of the prepared tin.
Combine all filling ingredients (except raspberries) in a large bowl. Mix until smooth. Pour mixture on top of the biscuit base. Arrange raspberries on top.
Bake in preheated oven for about 45 minutes, or until set. Watch the top so it doesn't brown too much. Cool in oven.