Originally Posted by
asouli
I'm flying tomorrow SIN-LHR in Y. Y and W are full, but J and F have space. I have read that if you are SCH/GCH, it's best to OLCI early ex-T5 as the back office will op-up. But ex-SIN, should I OLCI early or wait for the airport
Best to OLCI regardless of status or not, this way BA knows you're definitely on the flight and gives the mysterious backroom people a chance to move people around, if necessary. It is not a 100% guarantee that you will be op-upped, if at all.
Last couple of LHR-SYD returns in Y, I've not been op-upped despite oversold cabin, gold status and OLCI.
Can't answer your second post as I've not had that experience.