I hate fan ovens! I've got one, been in the house since it was built. You can see I don't replace things for the sake of things. House built early 80s! I always burnt pizzas around edges whilst middle was uncooked.
I bought a little gadget called a Remoska, which is a pan with a heating element in the lid and it does everything that the oven can do, bake, roast etc. You can slow it down a little by fitting a foil lid over food if you want slower cooking. It is a device from Czechoslovakia which was introduced to this country a few years ago. They are selling well at Lakeland.
I bake cakes and cook all those little things that are so wasteful in an oven. Only use the oven for bigger things.