You need to keep your eyes open. The Flight Connections route is signed with purple signs, so if you look for those you will be in the correct stream. You also want to make sure that when the purple signs give you a choice of terminal, you're following the route for Flight Connections Terminal 5. (On the assumption that you are flying from Denver to LHR, you will both arrive at and depart from T5 - no terminal change involved.)   Your inbound flight will very probably arrive at a satel