I drove my car this morning, left it parked for 30 minutes, when I came to start it, nothing. Tried the spare key, in case the fob battery was flat, still no joy. Scanned with VCDS and the only faults it show are glow plug open circuits on 4 cylinders. When turning the key, it's as the the starter isn't engaging (can't hear the solenoid). The dash lights don't dim. Tried a jumpstart, in case it was the battery. Still nothing. Any ideas??