Sorry for not replying earlier DG,
The problem was with my gear selector, riding the bike for the second time it got stuck in first gear, at first I thought the gear changer was loose but when looking closer at it I found that the shaft was spinning. When come to the weld that holds the selector onto the shaft had broken. From what I hear this is happening to a few of the new Rev4's. It is quite a quick and easy repair, just one we shouldn't have to do after 4 hours riding!
Apart from that 'little' hiccup the bike is brilliant!