OK, Stupid as it was, I carried out a backup of NDS from a Source
pre-migration server, using the NWCONFIG > Directory Options > Directory
Backup and Restore options > Save Local NDS information before hardware

I didn't spot the bit where it DISABLES NDS!

Question is then, how do I undo my stupid mistake?

Kind of urgent as nobody can authenticate against this server right now!

Many Thanks
A rather regretful Alan!