Edited to add: I stuffed up the quote below - apols (bloody app, grr)
Incidentally, my MMB screen for a LHR-DUB (BA flight number) in October says
Flight BA8134 to Dublin on Fri XX Oct 2012 17:00
Lounges
The Great British Lounge
Location: Terminal 1, Gate 5
Catch up on work before you travel, enjoy a snack or simply unwind in a relaxing area away from the busy airport environment.
The plot thickens![/QUOTE]
Tried using a printout of that to get into GBL a month of two ago - didn't work, but said they'd flag problem....