Andy Burns wrote:

the bottom element is the culprit

Flipped the oven over and got the element out, it looks as clean as a
whistle ... there seem to be only three in stock in the UK (several of
the espares/4neff/partmaster websites are the same thing in disguise)
all want about £50 for it.

There's one available from Holland for £13, but as mine is stamped 240V,
I guess that one might actually be for 220V, so much for harmonised 230V?