Coffee and Walnut Sponge Cake

I made this for hubby at his request in between making my Christmas Cakes, he just wanted something different in his packed lunch for work which I make him every day. Unfortunately, he only managed to eat a quarter of it as our mischievous dog Kaara decided it was her treat too. I came home from work that evening to find that she had managed to get the cake box off the worktop, the lid was at the bottom of the stairs and the bottom of the box was in the conservatory. The cake, what was left was still on its plate upside down in the hall, with all the walnuts gone and all the butter cream filling and topping eaten. How the plate did not break I will never know as we have tiled flooring in the hall and kitchen. She must have had a fun time whilst we were both at work.