In reply to gingernick:
If you go up the D106L, the road out of Lans-en-Vecors up to the ski area (I think, from memory and google maps!) you can park at an obvious spot near the big right hand hairpin, walk along a dirt track and you'll come to two very well bolted slabs on the left with routes between 3 and 5 on them, we found these excellent for our lads when we were out there. They do get busy though as they are used for groups. I think we found out about them in the tourist info in Lans-en-Vecores.