Homemade cake is always superior to shop bought. Always. Anything made by hand in small quantities, designed to be eaten within a few days, is going to be much better than stuff mass produced in a factory.
My victoria sponge is made with butter, eggs, flour, sugar and strawberry jam. That's it.
Tesco's version has: Sugar, Wheat Flour (Wheat Flour, Calcium Carbonate, Iron, Niacin, Thiamin), Raspberry Jam (11%), Pasteurised Egg, Butter (Milk), Glucose Syrup, Water, Rapeseed Oil, Pasteurised Egg White, Humectant (Glycerol), Whey Powder (Milk), Palm Oil, Wheat Starch, Raising Agents (Disodium Diphosphate, Potassium Bicarbonate), Emulsifiers (Mono- and Di-Glycerides of Fatty Acids, Polyglycerol Esters of Fatty Acids), Invert Sugar Syrup, Preservative (Potassium Sorbate), Cornflour, Flavouring.
Raspberry Jam contains: Glucose-Fructose Syrup, Raspberry Purée, Sugar, Gelling Agent (Pectin), Acidity Regulators (Malic Acid, Sodium Citrate), Colours (Anthocyanins, Plain Caramel), Preservative (Potassium Sorbate).
Yum yum. 
People are so weird about hygiene and germs and these threads where people are agreeing that it's perfectly normal to sanitise the fuck out of everything and only ever eat from restaurants and NEVER homemade as it's manky/dangerous just reinforces disordered thinking. All these "eww, manky and HOMEMADE" parents passing their neurotic behaviour onto their kids.