Ok, well here's where I'm at with the PC.
I've managed to properly reinstate the primary partition so that Windows on another machine can see and manipulate it without Find & Mount, but the only copies of the encryption keys are within the encrypted folders, so two people must loose their data.
One person is me, but I found some DVDs I made at the start of the month and it's a backup of my Amiga files, so aside from some recent stuff I'm almost OK there.
The other person is my 10yo son...he'll just have to build his up again, as he backed up nothing...bummer
As for the more important business of the Minimig, I've still had no luck getting it to start.
It still can't recognize the SD card for some reason!
PZ.