Loose Rivets,
Thanks for your advice!
I've had what my physio has termed frozen shoulder which started back in about April this year. All the best x-rays and ultrasounds revealed no problems. At the outset it was painful to even move my shoulder to put a shirt or jacket on. It has settled down somewhat now but I still cannot bend my left arm and put my hand up my back anywhere near as high as I can with the non affected shoulder.