Thanks for the replies. When I took the wheel out I found that the rubber "cush" drives has completely failed! I cut the remaining rubber out then cleaned up with emery cloth leaving the outter sleave of the bush in place. I then made up some alloy plugs 20MM OD 20MM Long with an M10 thread through. I loctited these in place with 648, no more circlip just bolted on with M10X25 socket cap heads. Did a trial on Sunday all seems OK.