As I remember 33L was still an active runway when I arrived in 64.
My best memory of 05R was being Tower Supervisor on the first day of the full use of Mediator when I decided that the wind justified the use of 05. Chaos ensued, not only down in APC but at West Drayton. I should perhaps explain that the Center radar controllers initially under the full Mediator were the old 'D' men and their radar expertise was sadly lacking, the proper radar controllers, ex Southern Center, had been made to return to the wing positions as 'A' men.
Your chances of doing 05 approachs as a radar controller at LHR were few and far between so the combination of the two was something to watch. Spacing on the approach, the later part of which was visual, was shall we say variable, the only problem for the Air Controller was whether he/she could get one,two or no departures away on 10R between two arrivals on 05. The finals call on 05 was "crossing the river"
Happy Days