You may well have the advantage on me there, Dave - 50+ years ago ! However, we were definitely on 05 landings that day, so it must have been for 05R. It was a morning duty with NE gale & I went out for a break into the car park, to see the DC8 tearing D/W to the west of West Drayton town. Quite an impressive sight. If I remember my geography correctly, it would have been a tight D/W for 05L !