I'm not a believer in this incident, something happened here but i'm doubtful it was a UFO Crash or incident. Lights were seen in the sky but there was also a mild earthquake in the area and lights have been associated with lights.

A new book has been published by Steven Lumley

'The Berwyn Mountains Incident Revealed' it seems to have mixed reviews.

There is a ufo documentary on it called Britain's Closest Encounters - Berwyn Mountain Mystery which is available on you tube