Patchy bit of work done on the car today. Wired in the fog light and the brake test circuit. Battery seems very low though, as the headlight relay doesn't work. It's only to be expected really as I keep starting the car without running it for any period of time. That and all the light testing means the battery has taken a hammering. An overnight charge should sort it out. Still need little bits and pieces to continue any meaningful progress.
Oil in the diff and a few bolts to tighten and the car is driveable!