Jag XF 3.0S and 10 yr old Micra 1.2 auto with Air Con.
Driven in France many times, always use a current map book with fixed cameras printed. Easy to keep tabs on with a co-driver/navigator since there are not too many, and a bit of work on the map before you leave will pay dividends, add a big post-it on the page. Mobiles are a different matter, almost got caught by one just before the turn off for the tunnel at the Calais end of the Boulogne/Calais motorway. It seems that Brits like one last burst of speed before leaving mainland Europe, and the French will catch them on the final stretch, plus you just might miss your shuttle connection. The DVD Sat Nav (2003 Comand) works fine in Europe using their 5/6 number system and has always got me within a few feet of destination. A recent upgraded disc from 2011 SAT NAV UPDATES for just £42 works a treat.