I'm pleased you're pleased Jonty
Like I said, I am asking on behalf of a 3rd party, partly because my honesty, sincerity and integrity (if you'll pardon me mentioning them) have a little history on here versus a 3rd party who when making such a request would raise obvious questions in regard to the aspects you have mentioned above. I had hoped that could all be avoided by me posting rather than them. It seems not.
If you recognise the rifle you'll know why. I'm not sure it's anything the wider community would benefit from knowing, save to satisfy their curiosity. The rifle has been legally held at all times AFAIAA.