It tasted really nice too!
You can find this recipe at http://allrecipes.co.uk/recipe/17062/chocolate-olive-oil-cake.
This cake is very easy to make, although you do have to fiddle about lining your cake tin with parchment! It is dairy free and I made it with wheat free flour to cater for the man of the house who is on a gluten free diet. It is very rich and moist, but I would probably cut down on the quantity of olive oil, the recipe uses 80g olive oil, I think 50/60g would be better.
If you decide to try this recipe, let me know how you get on, it's good to share!