Right, why is the bottom of my cake burnt?

[stroppyknickers]

Oven is electric, top oven is normal, single shelf, bottom oven is fan, double shelf thing. Used a spring bottom tin to make a lemon cake in the top oven. Cake fab, but bottom burnt. Why? Greased and base lined tin btw. XXXXXXX

bump, need help on this! Planning more baking...

was your tin standing on a baking sheet by any chance? Seem to remember that this will increase the heat to the bottom of your tin (something to do with conducting heat, but I dropped Physics in the 3rd year so can't be more specific than that!).

No, but it was on the bottom of the oven! Thank you!