S6 Wont start

[Baggee]

Wife went to work Fri in the S6m then phoned me at 4 to say it wouldn't start. Bearing in mind its an auto, when you put the key in and turn it there's absolutely nothing. The starter motor doesn't try and turn (it maybe shagged, but hasn't showed any signs of problems). Battery is ok. AA came out and checked it over, all the fuses are ok. He checked the battery and used his booster to try and start it all to no avail. Due to the weather conditions and the car park being dangerous I wasn't happy with him trying to get the under tray off to get to the starter motor to check it out. To me its as though the system thinks its in drive and wont try and start. Even taking it out of P and moving it through the selection and back into P it won't start so I don't think its the inhibitor. Any ideas for what might be a simple fix anyone?