Originally Posted by blackjack-21

Definitely landside, goalie.

As I mentioned, it's on the attached parking garage of LHR's T-2, with a walkway from the garage's lower level directly into the checkin, security areas, and boarding gates in the main building or T-2B. We had several hours between connecting flights that day, and followed the signage to the elevators for the small, well marked smoking area on the roof.

bj-21.