+1 for ADAC.
We've not had to call them out ourselves (touch wood!) but my parents are also with the ADAC. They have a an F reg campervan that they use to go all over Europe and they've had the ADAC out to them a few times and apparently they've always been absolutely brilliant.
It's cheap and it covers you all through Europe, and as DH says if you call them out here it's the flaming AA that actually come anyway!
They send you a lovely magazine all in German every so often as well
