One more thing.....
The starter on the Quantum - it wouldn't work if the engine had got hot. remember?
I took it for a rebuild at Burghfield Starter & Alternator Centre, put it on, checked it turned the engine over - it did, so I re-built all the cooling system around it ....... and it stopped working.
When I'd finished swearing, I took it off again & returned it, I got a call the following day to say it was repaired - one segment of the armature was faulty. I put it back on the car & it was turning the engine quite slowly, but it speeded up & the engine fired.
It was the same the next time, but since then it's got better, so I'm calling that a fix.