As above, A.Rice was my Grandfather but as he died when I was about 3 or 4 my memories of him are very vague! What I can tell you though (with some reasonable amount of certainty) is Kingfisher Line didn't start building boats until after his death.
The business first started as hire boat company concentrating on weekly hires using boats that were bought from another boatbuilder. For some reason, the business changed to day hire only with all the boats being built on site.
But there's a twist, A. Rice was also my Grans initial (Audrey). Highly unlikely I think, but it's possible it could be her name being used, but more likely, you've bought one the original hire boats (built by another yard unknown to me)