There are many local sea rescue services, not just the RNLI. I can see the point of Ofcom bringing in the MCA to manage a block of emergency service channels, and including the RNLI. These organisations work together, and need to talk with each other.
There are rescue and air ambulance helicopters. The RAF still, as far as I know, has its own Mountain Rescue teams. And, amongst those who go down the sea in ships, there is the Royal Navy.
But, whichever organisation gets the job of coordinating all this, I'd feel happier keeping the Civil Service out of it. Ever since, as a small child, I was a passenger on a boat between Brixham and Dartmouth, I've known the sea doesn't care.
The QRM code seems particularly appropriate for these circumstances.