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Despite promising all its otherworldly data had already been released, Daily Star Online can reveal a further 18 files will be made available next year.

MoD officials previously claimed the last of their real life X-Files were released last June.

Now, however, the government will declassify and release the archive to the National Archives by the end of the year.

The public will have access to the files around September 2015.

Nick Pope, a former MoD official himself, said how important these files could be.

"This is a huge embarrassment for the MoD and will have UFO enthusiasts up in arms," he said.

"When the government said that all its UFO files had been released, conspiracy theorists didn't believe everything had been made public and it turns out they were right.

He added: "The 18 files include ones from RAF radar specialists and from the ultra-secretive Defence Intelligence Staff, so there may be some fascinating revelations still to come."

Conspiracy theorists, alien enthusiasts and Ufologists will be tripping over themselves to get their hands on these new files.

The UFO community were previously been concerned the MoD had withheld some of its more sensitive cases.

Last June was the end of a five-year programme which promised to release all of the British government's information on aliens and UFOs.

In 2007 the MoD made the decision to release its entire UFO archive, following in the footsteps of the French government who did the same earlier that year.

At the time, the department was swamped with Freedom of Information Act requests - UFOs were the most requested subject.

In December that year, the MoD confirmed the news of the release to Pope who subsequently leaked it to the media.

Some of the files are open and shut cases - one witness saw a flying object with green and red lights… heading in the direction of Gatwick Airport.

Other less explainable files detail the story of a witness who saw a saucer-type ship with lights on it - the size of a full football pitch.

In another instance, a group of complete strangers stopped and watched a UFO hover and zip around over the Thames.

So, apparently, the truth is out there - or at least will be this time next year.