Originally Posted by
becket5
The Oneworld lounges in T3 are almost certain not to allow entry without a boarding pass. There could also be problems when you try to re-enter the customs hall to exit the terminal. I suppose you could try walking out through the security lines for people entering the departures area but you I'm sure you would get stopped and asked to explain what you're doing.
Best to just go to the AA arrivals lounge which is fit for purpose.
You would get more than that, because at that point you would be trying to enter the UK without having gone through passport control. Detention and deportation would not be an impossible outcome. I suspect you are also committing criminal trespass by being in the T3 departure area without a valid reason.
Now, I'll shut up as this is still off-topic for this thread. Perhaps the mods should move these last few posts to appropriate thread.