It's easy peasy.
8oz each stork marg, flour, caster sugar. 4 eggs. Four tablespoons camp coffee essence. Couple ounces of crushed walnuts. Cream marg and sugar, beat in eggs and fold in flour. or whack the lot in food processor. Divide between two 8 inch sandwich tins. Takes 20-25 mind to cook.
Make buttercream - 6oz icing sugar to 3oz butter. Flavour with two tablespoons coffee essence. Sandwich cakes together with half and spread rest on top. Decorate with walnut halves.
Master shout would be mine if fat Greg ever got his laughing gear round that.