Before the days of TCAS, we were cleared to descend to 10,000ft , Onjuku VOR inbound to Haneda in a L1011. Unbeknown to us, a JAL 747 was also cleared to Onjuku 10,000ft outbound. We were IFR in cloud when we reported 10,000 Onjuku VOR when the JAL 747 cut across our bows so close that we saw the white underbelly and main gear doors of the aircraft.
Heathrow Director, I appreciate your professional pride and you may say this could not have happened to you but it did happen to us, albeit in Japan. ( I am not insinuating that Japanese ATC is unprofessional by the way).
West Coast , right on buddy!