Job done. I used
Minitool Partition Wizard. System Image now on separate partition, NTFS. Other stuff in shrinked partition still FAT32, no bother at this point.
Was just desperate to get a system backup and, touchwood, a repair disc.
Regards to all.
Peliwhotsit.
(and all this on the day when they got the Large Hardon Collider banging ping-pong balls into each other).