I had a Creda cooker of similar vintage in my last house
I wonder how that happened. A broken cast iron pan?!
The following comes from inclination and instinct rather than from any position of knowledge. Follow the advice at your own risk.
My inclination would be to try araldite. Alternatively, use the oven and a microwave for everything else.
Araldite should be reasonably heat resistant - in so far as you're not using the ring under the araldite... and it should be waterproof enough too. I'd disable the broken ring, personally, with tape over the switch.
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