The Mouse works fine when running Bianca from Live CD.
From reading the link you provided John, I suspect that my problem is with the chipset. I will see if I can try it out later in the week, but I will need someone to tell me exactly how to do it, as I do not know what 'sudo' means.
Is it likely that this fix will be incorporated into the next Mint release? If so I may just hang on for that as Bianca is working fine, and I find it easier to work with than XP.
It helps greatly to know that there are people like you out there who are so willing to give up time to assist others. Thank you.