Colin Revel cycled Paris-Vigny-Gournay-Dieppe in 2013, using my route except for a scenic alternative Vigny to Gournay. Here are some of his notes:

Vigny to Gournay (via Bray et Lu and Gisors, St Germer de Fly)


We used the Avenue Verte London Paris Route here. There have been massive improvements and now completion of this set of Routes from Paris to Dieppe is excellently sign posted.
 
i)        From Vignay to Bray et Lu is West through small villages on quiet minor roads, a short 400 metres grass track and a 1 kilometre bumpy track/road with lovely scenery.
 
ii)      From Bray et Lu to Gisors. A purpose built cycle path along River Epte Valley for 20 kilometres leads to beautiful town of Gisors.
 
iii)    Gisors to St Germer de Fly. The road out of Gisors (again well sign posted) is a mixture of flat along the valley, 1 large hill, again taking in some lovely small villages and scenery before dropping down into Bouchevillars and then into St Germer de Fly (where it re-joins Donald’s Route).
 
iv)    From St Germer de Fly to Gournay. Donald’s and Avenue Vertes route is different. Donald’s is best and much shorter having now done both.