Originally Posted by
shefgab
I guess not many people will be travelling with someone they know, at the same time, but on a different flight. If these rumours are true, I guess that more people do this than you'd think AND BA thinks it's costing them too much. Apart from the people that put their details on FT offering to guest, it probably won't effect many (BAEC) people.
You can't have it both ways.

Either it is common practise and a serious contributor to lounge overstuffing, or it is rare and banning it won't affect the lounge overcrowding.