Update on new clutch,friend thats doing the clutch on my bike called yesterday,he had been to Triumph factory talking to the technical team and to get a clutch basket.According to the technical team this clunking was a problem with a lot of the early models,the anti judder spring installed wrong,so once they found the problem the decided to upgrade a lot of the clutch components and also the Basket,which cured the problem totally,so he is going all the way on the bike and renewing everything in there,with all the upgraded stuff,i suppose it makes sense whilst it is all stripped down,to make sure the problem has been solved totally,the technical team advised the upgraded basket as well as the heavy duty clutch and lifter and other bits. The clutch that came out had very little wear as the bike has 8000 miles on it but had to come out anyway so if anyone else has this problem this is the answer hope it helps others MJ