Update: I just got two rolls of Provia back from the lab and am extremely happy with the results despite the boring subject matter (mainly carparks at work ) and the embarassingly small number of actual images on one roll (<cough>three<cough>). There's definitely nothing wrong with the actual image taking part of the camera's operation which is nice to know. I also picked up some more cheap B&W to re-test the film winder.

Ben