My Zafira is coming up to an 80000 mile service, and no longer has to be serviced at a main dealer. Can anyone suggest an independent in the SE London area for Vauxhall servicing? I would still like genuine Vauxhall parts (especially the oil, given the 20K service intervals), and a reset of the service light. Given that main dealers also have access to service recall bulletins etc. is it still worth using a main dealer?