Our oven which was in the house when we moved in 8 years ago seems to
either the grille or the oven element every two or three years.
Replacement is relatively straightforward, the elements costing twenty
or so quid
over the internet shopping.
So in my case it is a replacement, not a repair, of a failed part.
Guessing from the tone of the original post it may be cheaper and safer
in the long run
to call an engineer this time.