If you are burning cakes on the bottom and they are not properly cooked on top then obviously your oven is too hot. You can cure this problem in a number of ways. l) Move the regulator on your gas bottle completely in the opposite direction. this should regulate the flow of gas to your oven from maximum to minimum. You can check for the amount of the flow by turning on one of the top burners. You need the minimum setting possibly. Your regulator might need changing. If it does then get a German one for around 50 e.l. The others are Chinese, are often faulty and can be dangerous, so avoid the dark red coloured ones.
2) you could always try turning your oven down so that the flame is not so high as you are cooking with your oven set too high.
3) put a metal tray in the oven with about half an inch of water in it, then bake your sponges etc resting on a couple of metal objects so that the bottom of the baking tin is sitting in water, but not directly in contact with the metal tray. The bottom of your cakes should never burn if you do this.
4) warm your oven before you try making delicate things like sponges, and turn the flame down a little and the heat will be more evenly distributed.
5) when making cakes like sponges, it helps if all the ingredients are warm before you put in the oven. People often make the mistake of using eggs and butter from the fridge which you should never do. The batter takes longer to heat up and cook, and with a fierce oven which is not easily controlled they will burn on the bottom and the tops will not be cooked through.
