I see that the 1st SGB Flotilla was commanded by Sir Peter Scott, the son of Scott of the Antarctic and founder of the Slimbridge Wildfowl Trust in Gloucestershire.
Two powered 6pounder Molems. A 20mm Oerlikon and two powered twin mounts Vickers. 50 cal, either side of the Bridge. And that's not counting what the Skipper decided his boat needed.