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The National Archives published this edited extract from Chapter 2 of David Clarke's 2009 book The UFO Files, which draws on Ministry of Defence UFO records. It covers Stan Hubbard's 1950 Farnborough sightings, which the Flying Saucer Working Party attributed to optical illusion or normal aircraft. It also covers Churchill's 1952 memo asking about flying saucers, the Topcliffe sighting during Operation Mainbrace, a Meteor crew's sighting from Little Rissington, and RAF research concluding that most radar 'angels' were birds.
THE UFO FILESTHE INSIDE STORY OF REAL-LIFE SIGHTINGS DAVID CLARKE
Document, cited by the archive. The PDF is mirrored here; the original link is above. 22 pages are in the text index: search them above, or from the library's search.