c17 over brum

well another strange spotting today. We had a C17 flying over Birmingham today, no more than 3000 feet, and going rather slowly in a south westerly direction.
Any ideas?
Any ideas?
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=34&t=98216
I had a feeling that might be the reason. Shame that seems to be the only reason we get airforce heavies over here.