Line a small rectangular dish with biscuits.
Place caramel in mixing bowl and stir until smooth.
Whip cream to stiff peak stage (don't over-whip).
Fold cream into caramel and grate 2 Peppermint Crisps into mixture.
Spread a generous amount of caramel mixture evenly over the layer of biscuits.
Add another layer of biscuits and repeat layers of caramel and biscuits with remaining ingredients, ending with a layer of caramel.
Refrigerate for an hour until set.
Bash remaining chocolates and sprinkle over just before serving.