Curly whirly cake

Named after the swirls on the top rather than the chocolate bar! I followed a recipe in my Konditor and Cook book that Hubby gave me for xmas, but same recipe is online here:

http://www.telegraph.co.uk/foodanddrink/recipes/10782866/Konditor-and-Cooks-Curly-Whirly-Cake-recipe.html

Tastes good but I think I could make a better job next time as I didn't have the best quality ingredients and had to swap a couple of things. The icing turned out beautifully apart from the chocolate curls. I wouldn't use an icing pen on the top next time as it was running too fast.