I will echo 172chicks comments about their Tunbridge Wells branch. I had all but a few of my Renault Dealership dealings with Whitehouse in Tunbribge Wells and all I can say is steer well clear.
They are all part of the same group - maybe the Tonbridge guys are a better bunch, but at T.Wells they are (IMHO) complete cowboys. I had a query over a servicing invoice but after 3 or 4 attempts at contacting the service manager there by phone and letter with no response, I actually made a formal written complaint about them to Renault UK, which resulted in the quickest phone call from head office I think was possible (the day after posting letter to Renault). On more than one occasion I had to take my car back so that they could finish or correct work that they had not completed properly. The service guys dont actually seem to give 2 hoots about you or your car - everything just seems to be a chore for them. I dont actually think they have any idea what customer care is, but maybe it was because my 172 was an import like 172chicks. I does appear that some dealers loath working on imported cars.
However it has to be said of the 3 other Renault dealerships in Sussex that I had dealings with (Swan in Worthing, Baldocks in Wivelsfield & Tates in Newhaven), none of the others were noticably any better! In fact Im still waiting to hear from one, with regard to warranty work they were going to do almost a year ago!
By contrast the Alfa Romeo dealers that I now deal with are top score. Everything delt with quickly and efficently when needed, which hasnt been as often as the 172!