Heres a good shout and cant recomend them highly enough GSM at the Gyle. Naturally they have a merc trained master technician there, so your cars in safe hands. Excellent labour rates too. Their websites all the w's gsmedinburgh.com (dont know how long a link would last.
Hi there, maybe a little to far away but can not recommend highly enough Carluke MOT Centre for fixing Mercedes, alan there is an absolute genius and is very very reasonable. One I would not recommend was Hart Motors in Clydebank, supposed Mercedes specialist, nah dont think so.