Assuming that everyone reading this thread is as big a Centurion geek as I, I won't hold back from posting Centurion trivia as I find it.
Attached is a monograph written by Shane Lovell of Canberra on Centurion tank turrets. It covers the first four types which were fitted to the production Mk 3 and Mk 5 tanks. It can be found online
here. The pdf is for those of you who wish to have your own copy.
Cheers,
Dan.