http://www.cycle-route.com/cycle-events/British_Heart_Foundation_Windsor_to_Bath-582.html
Cheers. Can see the route from that link though. Looking at it ill probably follow sustrans route 4 and drop down to cheddar instead of following it to bath unless anyone thinks there's a better route.
@dsalmon started
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http://www.cycle-route.com/cycle-events/British_Heart_Foundation_Windsor_to_Bath-582.html