Mr Pope said: "We do have several prototype aircraft and drones and other weapons you won't see on the news for another 10-15 years so if we did face a threat from the unknown then even if there is no Torchwood around now, there would be something like it by then and they certainly would have some great kit to help in the fight."

He said: "Look at the Taranis, which is a prototype made by BAE Systems. It looks for all the world like a spaceship in the hanger."

The official government position is that UFOs offer "no significant defence threat".

However, Mr Pope said what that really means is that "we don't know".

"My colleagues and I said, whatever our official position - the one we gave to the public, media or parliament, - privately, where five per cent of UFO sightings remained unexplained, at the very least there has to be a potential threat."

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