We have an old cooker, which is still functioning admirably. The only problem with it is the grill pan, which really needs replacing. Where, in the UK, can one find a replacement grill pan? It just needs to be rectangular and white!
Have you tried your local tip or recyling plant as they are now called! I managed to get a new glass plate for my micowave from ours might be worth a try
I had a similar problem with an old cooker, I went to a local second hand shop (the type that has fridges and filing cabinets on the pavement outside!) and the owner had a pile of grill pans, every shape, colour and size you could wish for - he said he keeps them from old ovens as people are always looking to buy them. Could be worth a look in your local 2nd hand shop!