Nix
This months Gazette had a supplement with garages etc recommended by MBOC UK members. Sorry, not got it to hand until the weekend as I left it at my brothers.
Lot's of small specialists out there who went freelance rather than stay with the bigger MB franchise dealers. Whether they are OK with an old 113 as opposed to a 202 C class is a different issue...
That said... try Brian Gunney Motor restoration is Cardiff (02920 810001/ 07710 077605). He's got an ad in this months Gazette and he's saying he does retoration, servicing and parts of 190SL, 113s, Fintails and Pontons
May be worth a visit
Our very own Ben did a piece on T&D Heaney in NornIreland. They will come to you an collect your car and take it away...
http://www.mercedesrestoration.co.ukYou could also chat with Auto Classico in Henfield, Bristol (01179 569115)