In reply to Richard Justice:
Can't say that I noticed a problem when I was there with a 60m rope. The heat on the other hand was mental, but it was the summer of the heat wave that was killing people in Paris. As far as working routes is concerned, it was all about on-sighting as fast as you could to get back down to the shade!
If it is really hot, there is little crag at Milhac, which is just north of Gourdon, a bit to the West of Castlenaud La Chappelle, and south of the river. It faces West rather than East and so gives you some more time in the shade in the morning. It is a lot smaller than le Ceou, but if it's too hot there. ..... If you get the blue series 1:25,000 Michelin map I think it's marked as Falaise des Corbeaux, or Rochers des Corbeaux - something like that.
I think it might be the place that's visible on streetview here
https://www.google.co.uk/maps/@44.7916412,1.3206321,3a,75y,17.17h,75.78t/da...
or possibly the one that's a bit further along the road to Milhac. I remember a 'climbers lay-by' at the roadside - it's all of a 1 minute walk from the road. If you head along the road towards Milhac, you'll see a car parked on the verge shortly after a sort of mill building - it might also be there. They're about 3 minutes apart in the car
Canoe trip on the river is recommended too.
Post edited at 12:57