Right then, having done a bit of driving about today I'm now really concerned that the mechanic has screwed something up! Starter is fine now, that seemed to fix itself after a couple of starts, what isn't ok anymore is the drive itself! I've now got a new noise that's difficult to explain and pulling away in 1st and then 2nd is very rough, I mean rough! Driving at cruising speed is definitely not as smooth as it used to be either, there's definitely some extra noise and vibrations. I've got everything crossed that it's something as simple as the engine mount being too tight after reinstallation, but I don't know if that would cause such severe symptoms. What worried me when he was trying to extract the starter from underneath was the way he jacked the engine up, one engine mount was removed and then the engine raised by 4 or 5 inches. This looked a bit extreme at the time, but he assured me that it was acceptable. I'm now thinking he fooked something up in the clutch/flywheel department - the clutch feels notchy now too.
He's coming out for a look tomorrow, but I've got no idea how things will go... to be continued...