Sorted !
Many thanks,
I had been almost following bnt's path before but had been jumping the gun and editing album info on the album ripping from drive D data - which allows the editing but is not effective on the library entry.
Ripping the first disk to library/B's then editing composer to Pink Floyd moved it to the P's, ripped the second disk as itself then re-edited P.F to Beathoven resulted in both disks with their tracks intact.