I also had the pleasure of visiting in 1984 as part of my prep for the ATCO board interview (I didn't succeed - became an engineer instead). As I recall it was a 'give us a call when you are outside on the doorstep' sort of arrangement.
I seem to remember being told at the time (my memory prompted by the pictures above) that there had to be a CCTV to cover the view of the intersection obstructed by that radar head. How did that come about - did no-one think of sightlines when they were planning the radar installation - was it really a problem?