New UFO files raise questions

But documents released by the ministry , available to read here, provide no conclusive evidence that extra-terrestrial life has visited Earth.

The release has raised further questions about UFO sightings - with an entire file about a claimed close encounter in Suffolk during 1980 absent.

Other files document sightings of ghostly lights in the sky. In one file, a man wrote to the Ministry of Defence saying he suspected being abducted after waking up with an extra hour one morning. The ministry later let him know the clocks had gone back that night.