400LS had a customer bring one up from OZ to the UK many moons ago, and his story of p*ssing off a QF 747 crew by descending after a comment was made on 12345, " a Cheyenne at 410 ?" to let the 747 crew have a butchers, then he fecked off back up to 410
He was an Ocker by the way & a furloughed QF SFO