Having spent far too long swapping sectors and fixing checksums on the sectors that I know were modified on my disk... I now realise that the source for the assumed 'untouched' sectors, from adfs already out there are not actually untouched... So I'll never get it to match that way...
I was working on the assumption that sectors that were identical in more than one image file meant that they couldn't have been changed from the original... but it turns out that one of the two images I was working from must have been copied from the other at some point in it's history, so sadly not untouched.
Could someone put me out of my misery and PM me the Workbench 1.3.2 U.K. P N 317789-03 ADF with CRC: C5692F06 (Proof of ownership of the original disk in first post)
Many thanks