Is this an early Training Course?

We are about to publish an article about one of these police officers  and we are wondering just how many people we can identify from this photo from the mid-1950's.  We believe it was probably taken when an overseas instructor came to Bermuda to hold a "Refresher Course" for constables.  If you can assist in any way in identifying anyone or everyone in the photo and also confirm the date it was taken and the reason for the gathering we would be delighted to hear from you.  Old copies of the Police Magazine may be a good source for tracking down this information.