BA never get the numbers right. On a recent flight there were three PSR's working down whilst one crew member was working up as a PSR called out from QRS. Maybe if they had a bit of organisation they would have sorted everything out as well saving money.
Just to clarify:
PSR is a "Purser" and QRS is a "Quick Response Standby" on 45min availability at a local airport hotel to cover last minute no shows/shortfalls
The Upper Deck Purser position was removed some time ago from the 747 and a surplus of Pursers resulted. There was no reduction to the Purser establishment hence the surplus but the option was given for Pursers to be rostered as Main Crew but retain their Purser rank and associated salary .
At briefing time it would have been apparent to the CSD that the crew were one short and that was an established Purser. Any proactive CSD would ask for a volunteer from the three assembled Pursers to work the Purser position and if none was forthcoming detail the most junior one and informed the standby desk that one QRS Main Crew was required.
Maybe if THEY had a bit of organisation THEY would have sorted everything out
I am sure it could be suggested by some that if YOU had a bit of organisation YOU would have helped sort everything out