Hi,
Just an update on this. I still haven't got those 8' floppies of unknown
origin to play with but I HAVE made a lot of progress with my own disks.
Thanks to everyone who gave me help with this.
Here's a writeup for those interested:
http://www.classic-computers.org.nz/blog/2017-04-15-adventures-with-an-8-in…
Terry (Tez)