Hello Britfan60 , That Norton 961 Manual is probably the old version. What I mean is , it is the first 961 manual that Norton published. There have been changes that the old manual will not have. For example the valve adjustment has changed. If the manual is a great deal go ahead and buy it. But if it is anywhere near 90 pounds buy from the factory like I did and get the latest version. I have both of them original and latest . If you are buying parts from Norton you may want to get a 961 Manual too !