This is one of my husband's favourite cakes, it's moist, nutty and not too sweet (a bit like him!), and a recipe I keep coming back too. It's from the BBC Good Food website, I originally found it in the Good Food magazine, which I buy every month. You'll find the recipe here.
Before I tried the recipe, I was skeptical that the milk chocolate would be too bland, but my concerns were unfounded, dark chocolate would totally overpower the delicate flavour of the nuts and the soured cream in the frosting offsets some of the sweetness.