I contacted Umarex in Germany who replied very quickly and referred me to Bisley-UK, John Rothery, their UK reps. I contacted John Rothery and had a quick and very helpful response from a lady in their Sales Office. On their instructions I have taken the pistol to my local gun shop and Rothery will pick it up and look at it. So far I am very impressed with Umarex and their UK reps. Fingers crossed!