@ F3G ... thanks for that route plan; a useful reminder.
As a humble J, I really thought I'd got lost by the time I'd done the "long walk" to reach the Galleries Lounge. You're quite right: "Concorde" has set a new standard in putting J-pax in the place an making them walk the extra mile [almost literally]. Did someone actually design this? Or is it like the kid controlling at JFK, who got to pencil in where the J-pax can't get access?
Anyway, next trip we're heading straight to the Galleries Lounge above our Gate in T5b [which never seems to get mentioned by either BA or BAA]. I only found it by accident once we'd done the journey to T5b to get ready to board.
Why do BA/BAA spend so much money on providing these facilities, and then make them so difficult to access?
Why do BA spend so much time pi55ing off J-pax?
[PS - don't even get me started on the "Priority Security" channel]