1. Lay half the biscuits on the bottom of a loaf pan.
2. Mix whip and custard and gently smear on top of the biscuits. Sprinkle blueberries and strawberries on top of whip. Repeat with a second layer.
3. Refrigerate at least two hours so biscuits get soft. Keep refrigerated until ready to serve.
4. To serve, slice between the biscuits for a neat cut.