So just get in the car and do it.
Whilst trying desperately hard not to paddle white water for a little while longer the lure of the river is still very strong. A willing paddle buddy was found (Max) and a quick over night paddling trip plan was formed.
A change of boats (originally the plan was to use the Pyranha Fusion and Wavesport Ethos) was a lucky twist of fate. Turns out that the Torridge from Hele Bridge near Hatherleigh to Bideford is a long way! Around 27 miles apparently.
See the river guide here: http://www.ukriversguidebook.co.uk/rivers/england/south-west/river-torridge-sheepwash-bridge-to-the-sea