Sorry, should haev gone to list:
Chris,
I'd recommend:
OmniFlop (Windows) http://www.shlock.co.uk/Utils/OmniFlop/OmniFlop.htm
or the bootable version of OmniDisk:
http://www.shlock.co.uk/Utils/OmniDisk
They should let you retrieve .adf disc images, provided the discs aren't copy protected and you don't have a machine with a problematic floppy controller.
Jason Watton, the author, is a very helpful chap, if you need support.
Peter.