I’m curious that a person with a background in risk assessment would find anecdotal evidence useful!
Rather than that being a criticism of your question, @PaulG , I’ll take your post as a reasonable invitation to open up the question of rural crime. It’s not anywhere near as bad as in the UK, but isolated properties will always attract “the Ungodly”. Even having someone checking up on it every so often won’t help. Good strong shutters are a must and you might explore CCTV (there are significant restrictions on its use, however, and it’s probably not a preventive).
Some people on SF have suffered a break-in (you can see who by searching posts using the appropriate terms!) but that information is hardly statistically relevant.
I have seen that sometimes French people will avoid making the outsides of their properties particularly attractive. I don’t know if that works: I doubt it, because a criminal will always go for the easiest and most isolated opportunity. Balanced against that is the fact that large conurbations will suffer a significantly higher crime rate than rural locations.
I’m surprised that you’re using central London as your benchmark! I spent time there in my youth; going back to Durham City was an enormous contrast. La France profonde would be, to Durham, as Durham was to London! If you’ve lived in an isolated house in the French countryside before, then you’ll know what you’re seeking; if not, you might well find it insufferable. I’d certainly recommend you try renting first: you may find it very cheap (because few French people want that sort of house) and a useful experience.
So, no, I can’t understand your desire to live without neighbours! But plenty of people on SF do exactly that: we are very diverse! We knew - because of holidays spent in isolated gites, in cities, in towns, in vollages - that living out in the countryside wasn’t for us. We’re on the edge of a town of 7 000 which suits us very well. It’s not at all like being without neighbours, but it’s a world away from town life in the UK!
If, however, you’re just looking for a holiday home that will be left empty for most of the year, might renting for the time you want to be there be a better idea? It would certainly be cheaper and less of a worry.