BA398 LHR-BRU 06/02
Gate C56
Separate lines for all 5 groups, but not obvious to people which side of the numbered barrier they should stand on unless they counted the lanes from Group 1. Consequently the masses all joined a long line for Group 4 and no passengers in Group 5 apparently. Announcements to remain seated until your Group number was called were ignored by the later groups who persisted with hovering around the barriers as though only the first half of them would be allowed onto the plane. Boarding by each group strictly enforced. Was in group 2 so didn't stick around to see what happened when they reached the horde in 4. Flight wasn't full so plenty of space for everyone onboard.