Further to this as I bought a new rig and of course hadn't wrote down my password anywhere!

A quick trick (if possible) is to check in your old game installation directory and open the log which contains your user ID and password. I also can't remember the exact folder/sub-folder. Just open it up with notepad (BE CAREFUL NOT TO SELECT THE OPTION "ALWAYS OPEN THIS TYPE OF FILE WITH THIS PROGRAM" bad things will happen), you want to open it as a single instance to read the text.
Perhaps someone could confirm the file location?

Mr. Skuzzy?