Line a 21 x 31 cm slice tray with foil. Place biscuits across base. In a large bowl combine all remaining ingredients except chocolate. Mix well and spread over biscuit base. Refrigerate until set.
Melt Chocolate in double boiler and then spread over buttered foil in a 28cm x 18cm slab tin. Refrigerate until hard. Mix other ingredients together and spread over top of chocolate and put in ...