Unknown 9mm Para

I’m looking for information on this 9mm cartridge.

3-6AF74254-AFC6-45BF-968C-134F49A7716A

I believe these were made at the request of the Special Air Service and were intended as an early form of ‘man marking’ cartridge. They were specifically required for anti-hijacking drills in aircraft. I have never seen one which is actually loaded but I understand coloured wax is pushed into the open mouth and this is then fired by the force of the primer.