I read this yesterday, and I was at a loss as to why the freakin' Brits would allow mayors and city councilmen to board a nuclear submarine.
And I have to wonder if somehow a staff security dispute escalated to cause this, or some sort of cronyistic behavior of one officer giving a tour of the nuke boat to a bunch of civvies and showing them classified things on the boat...
Seems irresponsible, no matter what, to allow the civvie cops to investigate and resolve this. The RN should be in charge of this. It's their boat. It's their crime scene. It's their people that were shot and did the shooting.