From: https://www.itsnicethat.com/articles/ufodrawings-publication-110917

David Clarke – the industrious journalist, folklorist, and professor at Sheffield Hallam University – recently gave a fascinating talk on his years of experience working with the UFO files of the UK Ministry of Defence. For those who would like to hear a relatively brief summary of some of the major highlights within those records, this is a must-listen.