Welcome to the forum Liz E.
As a tangential observation, I'd have thought the Grand Union canal near Watford was a far safer stretch of waterway than the River Nene at Northampton.
Even in the Nene marinas boats occasionally sink, due to widely fluctuating water levels and boats being tied to fixed pontoons. It happened to the member here called "Tree" IIRC, about ten years ago in Billing Aquadrome Marina, again IIRC.
But to answer your question I believe noddyboater here fits the bill.
https://www.canalworld.net/forums/index.php?/profile/28452-noddyboater/
And I think Captain Pegg too, but I'm not so sure.
https://www.canalworld.net/forums/index.php?/profile/25558-captain-pegg/