Not sure about that! This year, traveling F with BA I was asked for an invitation before entering the T3 Flounge dining room........what an absolute toss!
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It's to prevent OWE not flying First or JL or CX First Class Lounge Hoppers having access to Full Service Dinner facilities, as a BA First Passenger you should have been given an invite upon check-in by The Lounge Dragons. The Restaurant area is really not Big enough to cope with everybody who has F Lounge access. Hopefully one day the BKK service will move to T5 then this facility will close and First Class passengers will be able to enjoy the CCR.
But that doesn't necessitate a special invitation - a BA F BP should suffice!
I guess we are all well aware of the thread referred to in the OP here:...
Spot on - you would have thought a fist full of BA F BP's was a strong enough hint.