Does cooking it for a few minutes less really make that much difference? The sponge sprang back when pressed and the skewer came out clean, but can't remember if it was damp, but the taste was so dry that you needed a load of ice cream with each mouthful. Seems that the problem is a bit more...
Recipe then my request for help follows:
150g - Light Brown Sugar
200g - Unsalted Butter
100g - Dark Chocolate
175g - Plain Flour
50g - Cocoa Powder
2tsp - Baking Powder
1tsp - Bicarbonate of Soda
1/2tsp - Salt
4 - Eggs
2tbsp - Soured Cream
2 20cm tins lined and greased.
Preheat oven to 175...