A few people have asked exactly where we were walking in France, where the Chemin St Jacques actually runs. We walked part of the Via Podiensis, and there are several routes in France - the Via Aurealia, the Via Turonensis (from Paris), the Via Lemovicensi for pilgrims coming from Scandinavia (from the old word for Limoges), the Via Tolesana (through Toulouse) and many others.
This route starts in Le Puy en Velay, about 110kms further north east of Aumont-Aubrac (where we actuially started our section of the walk), and continues through Figeac, Cahors and Moissac, and joins the more traditional route at St-Jean-Pied-de-Port. It takes 4-5weeks to walk from Le Puy to St Jean along this route.
Here's an overview of the area with our route marked on it (A is Aumont-Aubrac and B is Conques - about 110kms apart):
and here's a more detailed map of the area in which we walked: