[McMurdo]

Gas cookers by law need to be chained to the wall or fitted with an anti-tip bracket, so you can't pull them over by mistake. Curiously I don't think the law applies to electric cookers, but gas and electric regulations are no doubt made by very different people.

I've unearthed a couple of Which? reviews of Tricity cookers from 1966; the marquis 644 and the electra-4 650.
Both failed safety tests. The 644's terminal box got hot enough to melt the supply cable. The 650's control panel interior temperature exceeded the limit set by BS3456.

Below is a late 60's Tricity, the 2-ring version of the 650 that failed the tests. (grace's guide)