this prompted a very old memory to rise up to the surface, about the incredible edible dormouse destroying electrics in cars and houses in the midlands
https://www.bbc.co.uk/programmes/p007q4rs
fwiw, the wikipedia entry on them is unusually poor I think; despite being very elusive, they have been found from Hampshire to Essex at least (see
https://www.ianvisits.co.uk/calendar/2023/02/05/the-edible-dormouse-with-dr-pat-morris-316199 ) and I rather suspect they came here with the Romans, like so much else that we regard as native edibles but actually arrived over those centuries. A random rich man might have brought some more in, but attributing the whole population to the actions of 1 man looks like typical historical fabrication to me. Most introductions need repeat seeding to take root. And memory of that bbc programme (sadly not available atm) is that they were associated particularly with Derbyshire, at that time.
Anyway, I'm sure you've posted about the stone marten before; I think it's more commonly known as a beech marten here. I wonder what it is about electric cables that attracts both species to sample them (and presumably get shocked for their troubles!)?