I've spent the day battling with the age old problem of my victoria sponges not rising.

Using the correct ingredients, I have now tried to make the sponge with a hand whisk and metal spoon, a food processor, an electric whisk and a combination of all of them, mixing butter and sugar with food processor then folding in flour and eggs with a spoon.

I have tried the oven on gas mark 4, 5, 6 and 7, at the centre of the oven (always recommended for baking cakes) and at the top of the oven

I have tried 7 inch and 10 inch baking tins.

All have had the exact same results, the mixture is cooking but not rising.
Any ideas where I am going wrong with my victoria sponge would be most welcome. Thanks.