Hello Ian
Should give you the opportunity to drive the Aero 8 on lots of great roads, especially in Spain. Weather wise it's also a very nice time of year, generally T'shirts and shorts during the day and a light sweater/jacket in the evening.
Do please be careful in France with the radar cameras and frequently changing speed limits aimed (I believe) to catch out motorists. And if you do get caught speeding make sure it's never more than +40km/h because that's where license confiscation occurs. I won't even mention +50km/h where they can seize your car....
I live about 175km west of Mont de Marsan, so sadly too far to hook up, though I'll be at a Nogaro circuit day on Sunday 17th Sept.
Cheers