Scanning through the thread, I don't recall anyone mentioning why it is actually being demolished. Its nothing to do with 'falling down' or asbestos. Simply that the ground space is needed for the new T2A area.
My office was in there until a few months ago and I can tell you that apart from technical equipment, the goldfish bowl was almost as it was left when it closed. And as has been mentioned, the ladder up to the top is still as 'interesting' as it always was! I'm amazed that the 'Elf and Safety' zealots didn't get in on the act.