There's an old saying that the best place to hide a book is in a library. The latest Ministry of Defence UFO files released to the National Archives contain more than 6,000 pages of documentation, so if there was a memo somewhere in there saying the MoD had a crashed spaceship hidden away in an RAF hangar somewhere, it might not be found.

Before I start all manner of conspiracy theories with that remark, however, I should say that there is no such memo and no such spaceship – and I say that as someone who spent three years of my 21-year MoD career working on this issue.

This is the fifth batch of UFO files to be made available and is part of an ongoing three-year programme to release the entire archive. The decision to release the files was taken in 2007, to deal with the administrative burden of responding to requests made under the Freedom of Information Act. At one time, MoD was receiving more FOI requests on UFOs than on any other subject.

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