Joy!!
Kept reading of people moving the spring to the other side to get tension. thought about this, but this cant be the answer, so i removed the motor and looked at the spring arrangement. Decided that it was hooked onto the wrong bar, which meant the jockey wheel position was to far clockwise to put tension in to the belt. I moved the spring location which moved the jockey wheel position further anticlockwise. Putting the belt round the spindle then moving the jockey whell to the right enabled the belt to go to the left side of the jockey wheel. Wheen released it put the belt under tension. VOILA!!
I can only summise that when the belt snaped the jockey whell springs round to the right and the spring detaches and hooks onto the wrong bar.
Hope this helps someone else as i have just spent the best part of 5 hours doing it.
Regards
Richard
richard ware, July 2006