Thank you Graham Moger!
I've spent all day on this oven, initially seeking to replace the element, but even that job is way more difficult than it should be on this model, given that you have to remove the back of the oven (being careful not to slice your fingers off on the edges!) to get to the element screw heads!
Once I'd completed that job, the wife mentioned the oven door handle was loose. Fixing that took twice as long as replacing the element, after struggling to get the oven glass out!
To anyone else out there, the manual's description of how to do it is fairly useless. However, it can be done, but it's fiddly and time consuming (for a novice DIY'er!).
Still, at least we can have our roast dinner now!
Ashley, April 2017