Yes, Benfield Silverlink is where the Ed30 and her GT TDi 170 go all the time, so would recommend them.
In my experience their service desk are better than their sales team.
I've found that by the time you've checked 'independent' garages for price and knowledge you're just as well to go to the dealer and haggle their price, by way of price matching etc.
I know there are some horror dealer stories out their but Benfield have always been spot on for servicing and any warranty work.