QDH ?
Nick,
I think this is a typo for QDM (there doesn't appear to be a QDH).
QDM is a "steer", or a request for one.
Your "Safety Path" sounds like the "Safety Lane" which is associated with a QGH ("Controlled Descent through Cloud", or a request for one - yes, I know the book answer is "May I Land ?", but I never heard it used in that sense).
In a QGH procedure, the ATC used manual (or later CR/DF and CADF) bearings to "home" the aircraft down a "Safety Lane" to the airfield. The only "Safe" thing about it was that there were no hills sticking up in it. It might be full of other aircraft, but unless they were under his control, or on radar, the ATC wouldn't know.
I would think that this procedure might well be in use in Kenya in those days.
Cheers,
Danny.