Did this yesterday arriving from LHR. Stand in T1. Stairs down to the building and walk a bit and the connecting door between Terminal 1 and 3 terminals are open, so you actually picked up your luggage from the belt in terminal 3 and you actually walk out of terminal 3 doors and then have to walk to terminal 1 building on the outside of the terminal since all car parking including meet and greet have been moved to Terminal 1 as well. All a bit confusing.