It's a real shame they did away with the spectators gallery, I guess they don't want people hanging around airports any more what with all the security alerts.
The viewing deck at LGW wasn't primarily a security concern, although the occasional jobsworth did ponce about up there looking all important and such. The main reason it closed was to allow extension of the S. terminal and now there is simply nowhere else to put it.
Did BAA try to find an alternative ? Bwaahahahaha