But Government officials hushed up the incident for fear of causing massive public alarm, he claims in his book The Berwyn Mountains Incident Revealed.
Lumley has partly based his findings on work done by investigator Russ Kellett over the last 20 years.
Both are convinced they have evidence of Britain’s equivalent to the Roswell mystery, when a UFO was said to have landed in New Mexico in 1947. The US military is accused of having kept the craft and the aliens aboard it hidden ever since.
According to the dailystar, Mr Kellett claimed three UFOs were spotted over the Irish Sea in 1974. As one headed towards the Berwyn Mountains, it was shot down by missiles from RAF jets and then crashed at Llandderfel.
Mr Kellett said: “Dozens of witnesses that night watched a glowing orb on the mountainside. A lot happened that night.”
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