Pre-heat the oven to 180°C conventional or 160ºC fan forced. Sift flours, spices and soda into a large mixing bowl.
Add the remaining ingredients and stir with a wooden spoon until just combined, don’t beat. Grease and line with baking paper a 20cm or 23cm cake tin (6 cm deep). Pour the cake mixture into the prepared tin and smooth the surface.
Bake for 1 hour or until cooked (when a skewer inserted into the centre of the cake comes out clean). Remove from oven, cool, then remove from the cake tin and peel away the paper. Swirl icing over the cake.
Cream Cheese Icing
Mix the Chelsea Icing Sugar and hot water together, add remaining ingredients then beat until a smooth consistency.