Well after an additional two days at the service centre I finally have the kk back home. They apparently had the wrong parts delivered ( that's what they told me anyway) and all is apparently ok for now. I took it through it's paces on a freeway not far from here and there was some noise on the outside of the car at 110kph but nothing like before. The one gripe I have with the service department ( besides keeping my car for a longer than expected period and not providing a loaner) is the condition the car was returned to me. I would have thought any reasonable mechanic would wash their hands before working on the headliner of any car and to return it with grubby handprints is less than professional. There is another strange anomaly with the headliner, it appears to have a crease in it , possibly from being folded up whilst they were working on it so I'm hoping that within a few days it will sort itself out but apart from that all is good. Thanks for your help Andy, without the TSB number I may well be going around in circles.