Global Supply Systems have at least two of the freight version in service in BA colours, they are based out of Stansted.
Lufthansa are due the first passenger version soon (it was due earlier this month but the launch event was postponed indefinitely)
Interesting, I'll keep my eyes open. Graveley is not all that far from the Stansted western approach, so an easterly from somewhere south of Stevenage might produce something.
