Jotown has given you the two guides to that section currently available in English. You can also buy the Lightfoot guides directly from Pilgrim Publications at http://pilgrimagepublications.com/pp_2014/via-francigena/
Pilgrim Publications Lightfoot Guide has GPS information if you are that way inclined.
The Lightfoot guide is bigger and has more pictures the Cicerone guide is more pocket sized.
Just to follow-up, I ordered the Lightfoot guide, it is available in two versions - paper back & E book. I downloaded the E book to my Ipad immediately for half the price of paper back, and no shipping and no tax. Thanks for the lead.