I used to bake victoria sponges in 2 small sandwich tins and they always came out evenly baked, lovely light texture and flavour...and woefully flat. So today, following my mum's advice, I bought a 20cm/8" diameter deeper, loose-bottomed tin and did the 6oz marg, 6oz caster ugar, 6oz s.r. flour, 3 egg recipe. Baked it for 43 mins at 160 in my Neff fan oven, by which time it was nicely browned on top, shrinking from sides of the tin, skewer came out clean. Couldn't believe it when I took it out the tin - sponge is about an inch deep! Gutted. Please tell me what I'm doing wrong! The only thing I can think of is that the "medium" size eggs I use for baking are pretty small - would that have an impact on the rise? 