Originally Posted by
G-BOAC
It's a BA lounge and Open Doors works just fine - whoever you're flying, that's rather the point of the benefit

But I'm not flying... my onward carrier is a ferry.
The Ultimate BA Guide says "BA Golds and Premiers are also allowed to use BA operated Club/Terraces lounges regardless of the airline they are flying on." I'm not flying on any airline.
I just checked the BA site and it uses the phrase "Travelling on any other carrier (departing from same terminal as BA flights)" - so I guess I should be OK.
Cheers