Thanks for the HELP, Spent a couple of hours this AM in the garage checking items such as shock aborbers as per instructions from company who supplied the axle, Then went down the route of investigating the sensor / spring. Could see nothing which would indicate a problem with the spring, we could apply movement of the suspension by physically lifting and dropping the vehicle, still could not find how the noise was happening until the spring was moved and supporte by a piece of cloth. Applied movement again and hey presto, noise had GONE! Drove a few mile no noise until I hit a pothole. Needless to say new spring ordered. Thanks again for the info, NO need to replace the axle (AGAIN, I HOPE) perhaps there was no need to purchase the axle originally, If only I had written on the members forum before. AN expensive mistake. :D