Badgers are the biggest problem. Look at at what the countryside has lost? Lapwings, Skylarks, Plovers, Hedgehogs, Hare, Bee's. All ground nesters. Badgers got the taste for Hedgehogs and Rabbits through eating road kill. I worked at a printers for a couple of years with some early starts. On the way to work you could see the Badgers dragging road kill into the under growth most mornings, with Foxes standing and watching. Add to that, all the fannies that bought ferrets and let them go due to them biting, and there you have it, a recipe for disaster.