Welshy - disk images are actually really easy to find... IF you know where to look!
http://www.cpcgamereviews.com/ has reviews and images for 1700 games. Just click the game title to download the disk image.
The current password it's requesting is for the user Pi, not for superuser (root).go2ford wrote: I have read that I can set a superuser password by
'sudo passwd root' -- which leads to a request for current and new pws