A UFO hunter is demanding a "scientific inquiry" into police footage showing a mysterious black object flying over the Bristol Channel. Gary Heseltine, the editor of UFO Truth magazine, claims the National Police Air Service (NPAS), which filmed the object last September, is purposely withholding information about the UFO. NPAS filmed the object for seven minutes and posted a short clip on Twitter, which shows a black, round object moving across the sky at a height of around 1,000ft (305 meters). It was filmed at night with an infrared camera on board a police helicopter.