On a blog I follow there is a blog post (http://www.iwalkalone.co.uk/?p=38699) about walking along the Itchen Navigation, from Southampton to Winchester.
Intrigued, my Google search led me to these links about the Itchen Way, a walk from Southampton to Winchester and beyond:
http://www.britishwalks.org/walks/Named/ItchenWay.php
http://thomashallett.com/walking-itchen-way-river/
I also found a second-hand paperback from 1990, Exploring the Itchen Way by Richard Kenchington, which I’ve just ordered from Abe Book. Perhaps I’ll make the effort to walk the Itchen Way or the Itchen Navigation, in the spring….
things change 
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