The Great British Lounge used to be a BA lounge that spanned two floors. How did it work in those days? Was there a domestic section or did domestic passengers have access to both floors of the Terraces?
A lot of people at the time couldn't understand why bmi didn't take over the ground floor of the former BA lounge and turn it into a single lounge for all destinations. That won't be happening now though as it looks like BAA is using the ground floor.