Preheat oven to 180°c

Grease cake tins and line bottom of tins with greaseproof paper

Melt chocolate and set to one side to cool slightly

Cream butter and sugar together until light and fluffy

Beat in eggs 1 at a time then add vanilla

Add cream and melted chocolate

Gently beat in flour and coca

Divide mixture into the cake tins and bake for 20 mins

To make icing; place chocolate in heatproof bowl, melt and set aside

Beat butter until light and fluffy then add icing sugar

Beat in coca, vanilla and melted chocolate

Sandwich cake together with icing and cover all over, place in fridge for a wee while to let icing set