Disc shaped craft is spotted circling near Stansted (audio)

On his way in to work this morning, Radio 5 live's sports reporter spotted a disc shaped craft circling above a field in Hertfordshire. Was it a UFO?  BBC News

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• UFO sightings have been made public by the FBI (audio)
• Britain and US 'were investigating' UFO sightings Matt Frei talks to Bill Birnes, host of the History Channel documentary series UFO Hunter, about the release of previously classified documents that show the British and US governments have been investigating UFO sightings for years.