Thanks for the input everyone.
Haven't chucked me out yet, I've got about 20 minutes to go...
Isn't the point of the Gold access anywhere that you don't actually have to be on a BA flight at all? Plus, in LHR I've had 7 hour layovers in the F lounge...
Before the TSA stopped people without boarding passes getting airside in the US, I would frequently go down to the PHL F/J lounges and have a tipple while waiting for mrs whmere to arrive on an inbound. Never a squeak. Have the rules changed? I thought this was a no-questions-asked policy.