I have stumbled across a few more businesses run from narrowboats. What a wonderful way to work each day. I saw mention of a "jewellery boat" and also these :
Book Barge - what a lovely idea. Moored at Barton Marina.
The Cheese Boat - or should I say "boats" as there is now two of them. You can look on the website for their upcoming locations.
Tiller Cycles - now this is a novel one! A bike shop on a narrowboat. Located between Leamington Spa and Braunston.
Ice Cream Boat - great idea for Summer.