Hi, thanks for replying. I cannot remember which characters, but they woud have probably included ones like £ $ %?, nothing unusual. I ending up using just letters and numbers. I don't want to have to change again as one of my devices is a camera high up and it means scanning a barcode on my phone with the camera. So letteres and numbers will have to suffice, shame

Just seen the bit about the £ symbol, that must have been the guilty one