You'll find full details on this sticky thread: -
http://forums.mercedesclub.org.uk/sh...ad.php?t=45278
I have found Mobilo excellent. Unlike many breakdown services they take the car to a proper MB dealer and provide you with a hire car while it is repaired (if it cannot be fixed where it is). And unlike AA and RAC I don't need separate cover for my wife or for any other drivers. All are covered. And covered in Europe too without the £100 extra that the AA and RAC charge for Euro cover.
This section from the sticky may interest you: -
ALL AGE GROUPS get Roadside Assistance with minor repairs at location; Recovery to nearest MB Authorised Repairer; Vehicle delivery service within 25 miles of MB Authorised Repairer; Transport provision within 25 miles of MB Authorised Repairer; Replacement vehicle for 5 days (but 3 days for those registered after April 2008); train plane fares and hotel accommodation, and even repatriation if abroad when the breakdown occurs (see T’s and C’s).