There's a chap near Gravesend that had a good few of these micro ferrets, also a chap lived on an island off southend had some, they came down from Scotland, he had trouble breeding them, the jills took a long time to get in kit. But they obviously worked out ok, thats how they got south of the river,
They were tiny, males, fully grown were no bigger than the length of your hand
They didn't have much in the way of jaw power, so you couldn't compare them to stoats