Belling XOU177SS Oven stopped working, but clock still works?

Everything on the oven (incl. grill/fan/internal light) stopped working whilst cooking sunday lunch...Except for the Clock, which still works! (it didn't trip the fusebox, but I have reset it off/on and reset the clock to ensure it was not the timer)
Can you tell me what the problem might be?
...and advise if it might be cheaper to replace or repair?