Chocolate Biscuit Cake

Here is our version of the Chocolate Biscuit Cake that Prince William has chosen for the royal wedding.  We hear as a boy this was his favorite dessert when he visited his grandmother, the Queen.  The palace recipe seems to be a well-kept secret, but we found one by former palace chef who describes the no-bake cake as a chilled chocolate-butter mousse speckled with crushed tea biscuits. We think Effie’s Oatcakes make a splendid biscuit for this extremely rich, chocolaty dessert.