Well done, spekesoftly!
Here are the min noise routings:
Couple of interesting points: there are no Standard Instrument Departures (SIDs) promulgated in the AIP, only 'Procedures for Outbound Aircraft', and no reference to this term in the Definitions section. So SIDs must have been introduced after mid-1969 but before early 1972, when they were definitely in effect at LHR. Also there are no departure (or arrival) procedures promulgated for runway 05L/23R. Was this runway already out of service?