Thanks for getting back! :-)
Okay, I had different settings, so I switched them to what you suggested; Turbo, PAL, OCS-A500, 1.0, 0.5, kick 1.3 but still no joy :-( I also tried changing disk speed, number of drives, etc. but it still comes up with a disk error after loading for a short time. Again, I've tried ADFs of both the full game and the demo, but neither seem to load...