This project was a helmet mounted display for the MBB105 helicopter. The display had some HUD function but was also slaved to the under mounted gun. As the pilot's head moves, so the gun under the helicopter moves with it, and the optical system identifies hard edges of vehicles and buildings for targeting.
The Panavia Tornado was the primary strike aircraft for the royal air force in the 80s. GEC Marconi was tasked with providing an avionics upgrade package that included a partial redesign of the e-scope
Much of my time at GEC Marconi Avionics was spent on the C17 Globemaster project. GEC were putting together an avionics package including the Head Up Display (HUD). HUD systems back then were usually comprised of two parts; the optics assembly, mounted in the pilot's field of view, and the computer system that drives the optics.
Way back in the 80s I worked for GEC Marconi Avionics. I have no idea why we were asked to do this but we had to design the laser rangefinder receiver for the Abrams tank. Of course in a company that does military work you never get to see the big picture.