Got back last night and I am not feeling 100% so I didn't get to it till this morning.  I tried starting again and the issue remains.  Fully charged battery but when I try to start it will not turn over.  I hear the solenoid kick in but the motor does not turn.  It also feels like there is a short because the whole car electrics die and you get the reset noise when you reconnect the battery.
So I have whipped off the intercooler and taken out the starter motor.  All the pos and earth wiring looks ok.  I dont know if there are any earths under the car but the one which goes direct to the starter motor seems good.  I put the motor on a bench and tested it.  Solenoid kicks in nicely and the motor turns.
So I am a little stuck.  The engine turns over manually in gear (tried pulling several feet with the towbar and no lockup).  The starter is fine.  Clutch engagement/disengagement is fine (visual check anyway).  My only theory is that the engine mounts are worn (fits with something else) and when I was joining the DC I must have changed gears too briskly and caused the block to move on its mounts.  This in turn may have knocked the motor a few mm which would prevent the teeth from engaging on the flywheel and a short in the motor.  Or that the motor just needed manually turning a bit because it was in a dead spot.  
Thoughts? 
