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I've used Worcester, Stratford and Evesham branches in the past. Cars bought from Stratford and Evesham but not Worcester due to a salesman that wasn't interested in finding me what I wanted or replying to my e-mails (don't think he's there any more).
I have used Worcester for parts and servicing over the years though. The parts department is ok (pretty good actually) but I've stopped using them for servicing now because I just wasn't happy with them.
Out of the three branches I'd say Evesham is the better one.