It's been years, but I thought hangar 6 was located near the crew car park. That has probably changed, but I believe the hangar is on the South side of the runway, off of the Charlwood Road, to the Perimeter Rd South (I know it is the Perimeter Road South..it is basically where BA's LGW maintenance hangar is). I trained there when BA had a mainline base at LGW. They gave us directions in my orientation packet when I started, but mind you this was over 14 years ago.
I found this pdf file on the internet that shows the hangar area:
http://www.crawley.gov.uk/stellent/g.../int149695.pdf