Faulty electric oven (Ignis AKL828/AV)

Question

Hi there.
I have an Ignis AKL828/AV (same as Whirpool) oven which just so happened to decide it wasn't going to work on Christmas Day.I have suspected for some time that the thermostat was faulty as there didn't seem to be a low heat setting.On the day in question I turned on the oven (used previously in the day) and left it to heat up.After a while an MCB tripped and when turned back on, the oven wouldn't heat up.It is a single fan oven with built in grill, which still works.
Many thanks for any help given.

David