A UFO spotted over Retford Town Hall, Nottinghamshire (Top-right) nationalarchives.gov.uk

The UK government's National Archives today released 34 UFO files of 9,000 pages from the Ministry of Defence (MoD) containing top secret memos in which UFOs were discussed, along with sightings and incidents reported by members of the public, during the period 1985-2007.

The photo of an Unidentified Flying Object (UFO) captured in 2004 outside Retford town hall in Nottinghamshire underwent expert analysis at the Ministry of Defence, and Defence Geographic and Imagery Intelligence Agency (DGIA), the latest files said. Alex Birch who captured the series of UFO images contacted the agencies in July 2004, to verify the identity of the object which appears to be in the vicinity of the brightly lit town hall.

''No definitive conclusions can be gathered from evidence submitted, however it may be coincidental that the illuminated plane of the object passes through the centre of the frame, indicating a possible lens anomaly, eg a droplet of moisture," DGIA report stated.

Documents on popular UFO sighting of 1956 at RAF (Royal Air Force) Lakenheath in Suffolk, reported by RAF fighter controller Freddie Wimbledon and MoD official Ralph Noyes, include a testimony in which Wimbledon says the RAF fighter planes tried intercepting a UFO seen on radar and by observers on the ground. But the UFO "latched onto" a fighter plane, ''following its every move'' before speeding off at ''terrific speed''. Noyes testified that he had seen a gun camera footage of the UFOs taken from aboard the aircraft at a special MoD screening in 1970.

The files also throws some light on one of the strangest alien stories, of a 2003 sighting of ''worm-shaped'' UFOs ''wriggling around in the sky'' over East Dulwich in London. A mother and daughter who testified at the MoD's UFO desk said that they had seen two men dressed in ''space suits and dark glasses who called themselves Mork and Mindy." They also testified that two cops, who had arrived upon their request to spot the UFO, met with the aliens in suit. However, the cops denied having seen aliens and said that ''they could not see anything in the sky and concluded it was possibly a reflection of a star and a street light in her window.''

The files also contain details of the mysterious lights seen moving 300ft above the Pyramid stage at the Glastonbury Festival on June 28, 2003 and of a UFO sighting over a music festival at Llanfyllin, Wales, in July 2006, according to a Telegraph report.

The documents also have descriptions on UFO sighting of 2006 which reportedly formed orange lights in the sky and on the mysterious objects spotted by the pilot and passengers of an aircraft over the Channel Islands in 2007.