Suz, thanks for your comments, I have found out that it was the feed dog adjustment screw that was worn. My repair shop could not get a replacement but I managed to get one from US sewingpartsonline. My repair shop replaced it for me free of charge because they said they should have been able to source it for me so that was great. I am really excited about the machine but haven't had time to "play " with it yet. Any tips would be appreciated.
Thanks to all who offered suggestions.