captain.speaking: Coincidentally, I've just been looking at the DA scheduled services for 1962, and in the timetable there is a three times weekly extension of the Bristol/Cardiff/Liverpool/Newcastle service to Dundee and Glasgow. Dundee is shown as being served via "HMS Condor, Arbroath" !
Not an answer but
I’ve a copy in front of me of the May 1969 issue of the ABC which shows the Autair Heathrow-Dundee service (Heralds: two a week direct, two via Carlisle and three via Blackpool) using RAF Leuchars.