The Royal Navy used to run warship-outlined narrowboats in the 1970s. I understand that one was a ballistic missile submarine. It appears that Waterways World ran an article about them in July 1977- all part of recruitment.
As one who was interviewed by the River Police about my terrorism threat before tackling the tidal Thames past Whitehall, I wonder what their approach might be to mini warships passing Parliament?
Albert's starter motor troubles are a little more serious than I originally thought. I have now sorted out a service exchange deal for a new motor. I will post more news when I get the problem sorted - hopefully early next week.