I'm not sure If I'm allowed to post this so feel free to remove if required. I've been using Owen Ferry Automotive in Paisley, Glasgow for a number of years he's looked after my old Boxster S and 728i. I've been recently going back to him with my wife's SL320. He's managed to fix a couple of issues that a closer supposed Merc specialist could not fix (only reason I went there was because Owen was on holiday). Prices very good and labour cheapest around the area. Very knowledgeable and works on all sorts from runabouts to Porsche, Merc's etc.