I switched off the ignition and the engine continued to run....Just like a petrol engine suffering pre-ignition...but she's a diesel. So brainless here, put it in first held the foot brake and dropped the clutch. Just about the same time I saw the smoke coming over the bonnet I realised what I was doing...Stalling an electric motor. They dont like it....
So looks like the solenoid failed, not sure how with the ignition in off... but end result is burnt out starter motor and suspect solenoid.
Anyone got a fast (non vauxhall main dealer) route to acquiring replacement parts at a competitive price...
Cheers, JBW



