Gentlemen..........
Further to my last:
By great good fortune I have found
DVD43 which removes region restrictions and works with (in my case) PowerDVD and VLC Media Player.
I was worried about finding 'something nasty in the woodshed', but
Softpedia offers it as spyware free and, when downloading it via Firefox, it scans as clean.
Just one point. Take care to download the correct software and not other offerings on the same page.
Thanks for your efforts everyone.
N o t a