I have exactly the same problem (grr no hot food for me tonight!). I live in Edinburgh (EH7) wonder if you could advise anyone up here who could fix it for me?
I seem to have the same problem too. It is a Diplomat APL 3201 oven. The grill works fine and the fan comes on but the oven just won’t heat up. The bulb has gone too. The first part of my post code is SE8.
Any ideas what I can do and/or who I could contact?