Thank you for your response, the garage has carried a number of other checks including running the car without the propshaft to confirm that this is still likely to be the problem area. Special attention was paid tom the support bearing fixing as this was the area of the original fault but his has not solved the problem. Alignment marks were rechecked although there seem to be some difficulty in finding them.
Current plan is to try rotating this shaft via the splines to see if this solves the problem( not that I hold out much hope). I have also noted that the original shaft used gaskets between the coupling but I thought this had been eliminated after 2004 models, mine being 2006.So I am still a little non plus. Local Jaguar Agent says they have never had problem with replacement shafts to date so cannot advise without viewing.Steve C