I still haven't managed to get a good photo, or at least one which does justice to this boat, which I believe is a Harrison Butler Yonne class. Pages 166/7 of Crusing Yachts Design and Performance, by T Harrison Buter has lines plan and general arrangement of the Yonne design.
I first noticed her on the river about 10 years ago, when she was painted a in very subtle green, but in recent years she has had this cream and blue livery, which I think is very attractive and shows off the varnished cabin sides perfectly.
Lopwell dam on the River Tavy
54 minutes ago