QDMx3,
It is indeed a useful thread - I hadn't realised before that the IGN charts had such a low vertical limit for their coverage.
I've been using the Aviasport/Cartabossy 1:1,000,000 chart as well since it is very clearly presented and good for route planning, but I ordered the SIA 1:1,000,000 charts and VFR guide this evening as well from a French site which I found via the excellent
nav2000.
As long as I can see out of the cockpit over the pile of charts, I should now have all the information I need, though it is a little worrying when they disagree about airspace limits.