Adrian,
Thanks for your comment about the Cromwell. It never came to my mind that this could have been a post-war civilian conversion.
I kept on thinking about a modification done by the Czech military, post-war . Have you got any pictures of your friends Cromwell? Is he restoring it back into a gun-tank again? I can imagine it is hard to find a Cromwell or Centaur turret, these days.
Kevin,
Thanks, Yes, I am also interested in the WW2 history of this specific Cromwell, so your reaction is very welcome. Great!
regards,
Alex