Mary Berry Carrot Cake

Cake (Self Raising Flour (Wheat Flour, Calcium Carbonate, Iron, Niacinamide, Thiamin, Raising Agents: Sodium Carbonates, Calcium Phosphates), Muscovado Sugar, Sunflower Oil, Carrot, Banana, Eggs, Walnuts, Raising Agents: E450i, E500ii, Wheat Starch), Icing (Mascarpone Cheese (Milk), Icing Sugar (Sugar, Maize Starch), Vanilla Extract (Sugar Syrup, Bourbon Vanilla Extract, Water, Spent Vanilla Seeds), Walnuts), Decoration (Sugar, Cocoa Butter, Whole Milk Powder, Skimmed Milk Powder, Anhydrous Milk Fat, Paprika Extract, Emulsifiers: Soya Lecithin, E476; Natural Vanilla Flavour, Fat-Reduced Cocoa Powder, Concentrate: (Safflower, Spirulina, Apple, Lemon)