We couldn't agree last time this subject came up and I doubt we will this time.
If foxes are still living where they always have then why has the rural population reduced over the same period that urban population has increased

Foxes are and always have been vermin. Just like rats, mice, starlings, pigeons and seagulls (to name but a few). They kill for the sake of killing (like some humans I suppose

) and are becoming more and more bold/brave around humans because of so many people feeding them. The fact remains, you'll rarely see a fox bold enough to be around humans in rural areas but in the urban environment the lentil munchers have given them free reign!
Anyway... As said before, I'll bet my £1 that there is more to the story than meets the eye

Possibly they (or someone very nearby) have been feeding them. Or possibly something else... I doubt we'll ever know!