This is actually happening. The National Archives just released the full West Freugh dossier from 1962 - the Scottish incident where RAF personnel allegedly tracked something unusual on radar near Stranraer.
The thing is, the redacted version from 2008 had basically nothing useful. But the newly released version includes the actual radar operator's notes, witness statements from four separate officers, and most correspondence with an unnamed American military attaché.
The American component is still redacted, obviously, but the fact that it's acknowledged in the file is new. Suggests this was a joint UK-US incident. Full PDF available on the National Archives website if anyone wants to dig through it.