If foxes were still legal, a man with a good dog could do very well squeeking urbans round Dartford & Bexleyheath parks and open spaces.
And if its rats, try the shrubberys planted around your local McDonalds or KFC, just mind the traffic.
Last winter we had a family stroll round Sefton Park Liverpool and the place was heaving with rats, all going about their business without a care. The people with children didn't give a fig about the rats either, not even when they jumped out of the litter bins as children threw rubbish in...!