Not wanting to be accused of being Obree obsessed this week, but I found this fascinating documentary whilst doing some research about him, on Youtube. I've watched the film, however this Channel 4 documentary is about as authentic as it comes.
The quality isn't brilliant, the sound - at times - terrible, however it gives you a real "fly on wall" feel of the competitiveness that existed between Obree and Boardman, culminating in Obree beating Boardman at the World Championships. If you want to watch it, you can view it here. It's chopped up into six minute chunks which you can keep linking sequentially to on the right. Really worth a watch.