Right i've been having a little lookie under the Zed tonight and discovered the spring wasnt seated properly in these 3 tabs mentioned above so i thought ive found the knocking, I seated it back properly and put the car back together . Time for the test drive , I get to the end of the road and turn onto a road where it always knocks and guess what? yep its still knocking so i pull over and set the rear suspension to the hardest setting as mentioned above, and go for about a 5 mile drive . Then about a mile from home i pull back over and wind them back to the middle setting and guess what? it appears to have disappeared Lets just see if it is gone for good!
How did doing that make it disappear though thats what i want to know?
Anyway thanks for the help guys Cheers Tom