I once read a book by an old estate keeper, could have been the turn of the century, in South Norfolk, a fox was sighted on an estate & keepers came from surrounding estates to try & get it, many were curious to see a fox, going back further to the 1830's, when fox hunting became popular, there were so few foxes around that they started to import them from Belgium so that they could hunt them. Georgian Edwardian & Victorian keepers were probably responsible for their demise, but that is not a given, maybe a fox was not so common. Going back to my childhood, most farmers kept free range poultry in the stubble after harvest, mobile chicken houses were everywhere, it wasn't until the early seventies that I first saw a fox, & our chickens started to get attacked. Saw my first Magpie in the late sixties, & that was in Suffolk.Never saw a Sparrowhawk or a Buzzard til the eighties, their demise wasn't from keepers it was organophosphates. Foxes were certainly not present in the numbers they are now, Just like Muntjac they started to colonise the cites, a safe sanctuary, I sqeaked them up in Stoke Newington, & Leeds, some came to the squeak, some didn't even know what a squeak was, would have done better rustling a Kebab wrapper. One thing is for sure, when I was a kid I saw much more wildlife, particularly ground nesting birds, coveys of grey partridge, fields black with peewits & plovers, yellowhammers skylarks etc the list goes on. Also saw many more barn owls, 3 pairs nested on this farm, saw more Harriers, even saw a Montagues Harrier, Honey Buzzards & Sea Eagles. And there were no keepers locally. On the great sporting estates round here, the Hare accounted for the biggest total, followed by Partridge & Snipe. To sum up, there may be decline in remoter rural areas of the fox, where control is practised, but it is actually getting it back to sensible/historic levels. There will always be a reservoir of numbers to top up from the towns & cities.