Ok, so it was the button that was disabling the window.... I had so many problems with it in the last couple of weeks (engine mis-fire and exhaust broke) one after another that I just thought it was something else going wrong! Cheers for the assistance and apologies for being a doofus! I'm glad I didn't take it back to the garage.....!
btw - had the car for 6-months, best car I've ever owned and despite the recent problems I've had it's well worth it for such a brilliant drive.
Cheers again,
Luke