Probably the element. Will need to know the right model though and it was here when we brought the house.
Found this which looks similar: http://www.ebay.co.uk/itm/Diplomat-Green-Double-Integrated-Oven-Model-ADP4514-/112151546785?_trksid=p2141725.m3641.l6368
Found this for it: http://www.buyspares.co.uk/cooker-oven/adp4514/element/catalogue.pl?shop=diplomat&path=357700&model_ref=1165345&refine=element
Either £19 or £50?
Need to check on the model though.
No model number in or around the doors. Found this: http://www.ukwhitegoods.co.uk/downloads/oven%20model%20numbers.pdf
Looks like I have to remove from it's housing.
Took it out. Model is: