B777-300ER by PMDG (See the attached pic)
Also, by default, the aircraft is positioned too far forward, with the cockpit in the wall. But with GSX I was able to move it back correctly. Nevertheless GSX doesn't let you adjust the positions in and out of the gateway. On the pic I think the gateway is fully extended, too short to the door.
The gate B14 is the new gate used recently by British Airways.
Thanks for your response