Gate 5 on a 767 to GLA Thursday, full flight. Gates policed well and chancers (a lot of them!) moved out of group 1. Importantly, Group 3s asked to leave the 2/3 queue and 2s moved forward. All done by the gate agent in under 1 minute, very easy and with no back-chat from passengers.
Had one gent in group 1 with his missus in 2, neither had hand baggage but they both stood in different queues from the off. Interesting I thought - people don't seem to think they're allowed guests in the queue, having said that I don't understand why someone would split from a spouse for the sake of boarding 1 min earlier... maybe that's just me.