Fitted with a Nimrod tail fin, XW626 "Sirius" makes a stop in Prestwick Main Terminal's old Bay1, before proceeding transatlantic to Goose Bay as ASCOT5251. Originally with BOAC as G-APDS, had been bought by the Ministry of Supply and became a testbed for the ill-fated Nimrod AEW3 project, displaying at Farnborough in 1978 further modified with the bulbous radar nose."