I believe it’s a EA rule nothing to do with the BA and if I remember right it’ only applies to yachts as they have limited space for a tank. Oh and it’s not a requirement for the BSS.
I was talking to someone recently about leasing a mooring to the BA they gave up in the end as the BA were to difficult to deal with. His words not mine I hasten to add.
I too had a rude awakening as one of Potter Heigham finest decided he needed to be back 2 hrs ago so went past at full throttle 6 ft from the boat. Lucky only one broken glass.
The blue boat is the previous owner of Papaver’s new craft, it’s not much of a looker in my opinion but it is very nice inside, I suppose you don’t see the outside when you are sat onboard.