Chaps. Thanks for your help. My online research had suggested that something, probably my memory, was not quite right: I am past 40 now afterall! I would have said that my sighting was while I was at home watching Blue Peter/Magpie/Newsround (or something like) after a day at grammar school which would make the time somewhere between 1979 and 1984. Also, I am not sure that I would have known what a B24 was in the early 70s if it was that long ago. Unless it was a secret CIA flight between Little Rissington and Kemble, and details of this are posted on WikiLeaks in the future, I guess this will remain a mystery. Thanks again.