Chocolate Marble Loaf Cake

Sponge Mix: (Sugar, WHEAT Flour, Dried Whole EGG, Emulsifier(Starch, E481, E475, E471), Raising Agents(E541, E500), MILK Protein, Dried EGG White, SOYA Flour, Preservative(E202, Salt, Xanthan Gum(E415), Water); Chocolate Sponge: (WHEAT Flour, Sugar, EGG Powder, Cocoa Powder, Rice Starch, Raising Agents: (E450, E500), WHEAT Starch, Maltodextrin, Skimmed MILK Powder, EGG White Powder, Emulsifiers: (E471, E472b, E477), Whey Powder: (MILK), WHEAT Gluten, Salt, Stabiliser: (E415), Natural Flavouring, Water); Belgium MILK Chocolate Chunks: (Sugar, whole MILK powder, cocoa butter, cocoa mass, Emulsifier: (SOYA Lecithin), Flavour)