The real reason that SO19 was changed to CO19 etc, was the simple fact that I own the .co.uk SO19 domain name.
The site was intended for use by myself and colleagues working in the TV & Film business as Supporting Artistes specialising in uniformed police roles that were very specific to the scenes being shot.
I then toyed with the idea of starting my own specialist police casting agency, taking on only ex or P/T serving officers. Unfortunately this never came about, although I still retain ownership of the domain.
Around 5 years ago I received an email offering me £2,000 for the domain name, I refused and heard nothing more. It was shortly after that when SO19 became CO19. There was a lot of debate on this subject when the change happened, and some ex officers have mentioned my innocent involvement.
What do you think?