By Ewan Gleadow Britain’s very own Bigfoot may be roaming one of our national parks, terrified locals say. Fishermen making late-night visits to an idyllic lake in South Downs have revealed that a “growling” creature patrols the area and has been spotted escaping down a “dangerous” hill. “No human” would dare venture the incline, with anglers concluding the strange noises and bumps in the night are the result of an elusive creature. Members of the Cryptid and Paranormal Investigations group on Facebook observed multiple instances of close calls with a creature so evil that it made the fisherme…