According to a -400 captain friend, the CAA have issued a type of waiver that allows those in Atlas Air employ, (pilots other than the Brits as GSS) to fly the G registered -400 that Atlas air has placed on the UK register. I would guess that allows all the American, and other non-EU types to operate a UK registered aircraft, so much for EU clout, and keeping those pesky continental cousins away from european flying, a wot?