I'm spending 10 days trundling around France & Switzerland on the MV in July. The start & finish point is near Basel, so I need a good route between Calais & Basel, for which I've allowed a day & a half each way. I'll be pushing my luck a bit with tyre life, especially as the trip includes a track day, so I can't deviate too far from a direct route. Anyone got any recommendations? The twistier the better.