I would take issue with the notion that Main dealer "technicians" have any more expertise than a good independent.
I have the feeling that many times on this and other fora that main dealer misdiagnosis has cost unnecessary time and money for defect non-rectification, particularly where your standard manufacturers fault code algorithm dogmatism takes over and a true understanding of how a system works is absent. Engine management , turbo, common rail technology and EGR based problems spring to mind.
Add into that main dealers may have a vested interest ( they need frachise goodwill from the manufacturer) in not fully divulging particular make/ model inherent defects, and are notorious for masking, hiding or denying problems; some Mazda owners may be particularly familiar with this.
The key with independent servicing is that they are VAT registered. A word of mouth approval is a good starting point and be specific with your requirements. Get a written undertaking or quote stating the use of OEM parts. Who is to say that an unscrupulous main dealer will not use cheap oil, coolant, brake fluid etc and charge premium brand prices?
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