Another dreamy Sunday night at T5. Dropped off at far end to use 1st class check-in. Some as yet unexplained snafu with my travel dept and BA resulted in 20mins of fruitlessly trying to check-in. Guided back to ticket sales (getting late and close to flight cut off) in zone E which if you haven’t been is the 1/2kilometer walk back along terminal. No line but lots of people being helped at desks by staff. Vexed man races up behind me shouting into his mobile. I hear him ask to jump queue ie me. I tell BA staff I won’t to give up my place as I was in danger of missing flight and did not yet have ticket. The BA employee ignored me, and put him ahead of me. I was upset. She showed incredibly poor judgement and had no answer when I questioned her reasoning and why she did not have manners enough to at least ask me to allow him ahead.