The story of the Wollaton gnomes is not a story about grey men, Bigfoot, or the usual bogeymen:
The Wollaton Gnomes was a classic anomalous encounter. 23 September 1979, a half dozen primary school children went for an evening walk in Wollaton Park in Nottingham. A number of these children then saw thirty small cars each with a gnome driver and passenger. The encounter lasted, according to the children, about fifteen minutes, as the gnome cars chased them around the park. The kids eventually escaped out into the surrounding streets where the gnomes declined to follow them.
More here.