I've just replaced the brake booster on the mk1, and of course now its all back together it won't start.
I did have to take the ignition module (its got electronic ignition) off the side of the engine bay to get the booster off and then on again. The only thing I can think it might be is the wire that's not connected in the photos below. I didn't notice if it was connected or not before I moved things.Its the double plug on the right that's the culprit. One wire goes to the radio suppressor, and the other disappears into the old loom.

There is a spare terminal on both the positive and negative sides (you can see the +ve one in the pic above, the -ve one is the same), and I did think about just hooking it up and seeing which one worked. But then I didn't want to blow anything up either.
I need to get her running tomorrow so I can get on down to Melbourne for SFS. So if anyone has any ideas please let me know.