Wish I could help Gaz.
I got so frustrated with Samba on Amiga that I gave up. (It was sucking too much time!). I Got it to work fine on Linux E3 and Solaris 9 to Win2003 with AD authentication at work but I couldn't do it at home with my Amiga. That is on 3.1 though. In the end I set up Xitami FTP Server on my XP PC / Server / Internet Router and just use AmiFTP.
I hope someone can help you as I would be interested in finding out myself.
