Britain Releases UFO Documents from 1987 to 1993
According to the National Archives site, reports include:
In November 1989, RAF Wattisham in Norfolk received 'One of our most unusual UFO reports'. An unidentified female was approached by a man who claimed to come from another planet, similar to earth. During the ten-minute conversation, the man claimed his race was responsible for creating crop circles and also explained he felt it was important for contact between the two peoples to occur. As she ran home, the woman heard a loud buzzing noise behind her, and turned to see a large, glowing spherical object rise steadily until out of sight.
In December 1992, two air traffic controllers at Heathrow airport reported seeing a black inverted boomerang-shaped UFO from the airport control tower early in the morning. One week earlier, numerous witnesses in Louth, Lincolnshire, reported seeing three lights which appeared to be attached to a large triangular craft.
Previously released documents can be found here.