I used to have a recipe for one but stupidly I let a friend borrow the piece of paper and she lost it.It was made with oil,cocoa powder,sugar but I can't remember the quantities, timing etc.The topping was delicious, sort of fudgy, and it was sandwiched together with double cream. It was my dD's favourite and both of them used to have it for their birthday cake every year. Don't suppose anyone knows/has the recipe ?