Thanks for the response/replies, I thought the question would never get an answer :-)
Also thanks for confirming that 'Import List' will not do the job.
I did check the plugin and even examined the code for hints.
My Python skills are zero but a plugin would be the best option.
I have found a possible answer by trawling the forum and according to Kovid I should use 'calibredb'.
See
https://www.mobileread.com/forums/showthread.php?t=89923
I will need to play with calibredb and probably script something.
1st problem I get the following error running a basic command 'calibredb list -f uuid':
c:\Downloads>calibredb list -f uuid
id uuid
Python function terminated unexpectedly
[Errno 12] Not enough space (Error Code: 1)
Traceback (most recent call last):
File "site.py", line 132, in main
File "site.py", line 109, in run_entry_point
File "site-packages\calibre\library\cli.py", line 1363, in main
File "site-packages\calibre\library\cli.py", line 198, in command_list
IOError: [Errno 12] Not enough space
The Drive Python and Calibre is installed on has 38.4GB free ?????
Have no clue what to change in Python and/or Calibre at this point.