they were Golf and November when they were B.E.A. aircraft but I can you confirm a lot of aircraft were given " unofficial "names using their last 2 registration letters a lot too unmentionable on Pprune by the engineering staff some aircraft had their registrations changed one that springs to mind was the Britannia N.B.G, it was known at LHR as No Bl***Y Good can't remember what it was changed to.;