Thanks to Dirty Modern Scoundrel for pointing us to this video. It dates from 1984.
As the blog says:
The documentary itself is a rather straightforward forerunner to his more complex classics such as A Century of the Self and the Power of Nightmares.
It's lacking his voice (it's narrated instead by reporter David Jones) and his trademark crazy soundtrack but otherwise many of the Curtis tropes are here: suspicion of those in high places and the whiff of institutionalised corruption and conspiracy. But the style feels more like an episode of Panorama rather than his later authored pieces.
Still, there's great interviews with T. Dan Smith, Kenneth Campbell and particularly Cleeve Barr, and some amazing archive footage.