When researching canal boats for Pak128.Britain, I looked up "tub boats", hoping to find something like this (http://www.nynehead.org/index.php/canal/tub-boats) or this:
(http://1.bp.blogspot.com/-eqbudp_v1TU/T2Op9bPj6CI/AAAAAAAAH38/gCdo_R93BTg/s1600/Tub+Boat+Blist+Hill.jpg)
However, the first link that I came upon was for a very different type of tub boat (http://www.bornrich.com/21000-hot-tug-hot-tub-boat-new-meaning-hot-tubbing.html):
(http://www.instablogsimages.com/1/2012/10/04/hot_tub_boat_1_upaki.jpg)
I wonder whether the bathers appreciate that their boat shares a name with a rather more prosaic vessel of the canal age of yore...