These curious extra-terrestrial cases were investigated by top secret Ministry of Defence department DI55.

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The files - which can now be accessed at the National Archives website - suggest the UK was swarming with alien spacecrafts in the late 1980s and early 1990s.

And the documents reveal sketches from witnesses were gathered to help get to the bottom of the alien invasions - similar to those investigated on hit TV series The X-Files.