I have now looked at the Michelin map. It seems pretty good. Not least as it is easy to see how (with a bit of imagination and effort) you could join the some of suggestions up. For a couple of quid spent (when divided between the obligatory six mates) it’s a decent enough thing to order.
I have also had a look at the six books and two other maps (those from IGN) that I ordered. All good but all in French, naturally. That doesn’t bother me too much as a map and a route is a map and a route. These publications are always streets ahead (pun intended) of anything in the UK.