Having checked out your link to that Find A Property website it would appear that it means Fareham has the highest number of owners actually living in the house they own, as opposed to renting it out... which I guess is why Tower Hamlets ranks so low?
itchypaws
Paulʼs weblog - I live some place you've not heard of in the deep South. Married and father to 2, I'm a full stack web engineer, + I do js / node, some ruby, other languages ect ect. I like pubs, parkrun, eating, home automation 🤖 and other diy jiggery-pokery, history, genealogy, telly, squirrels, pirates, lego, and TIME TRAVEL.