I had intermittent power loss on my s-class. I took the car to george and tolod him to check the egr valve first, he told me he fitted a new one and the problem was still there. During a period of 6 months the car sat at his garage for a total of 2.5 months. His final conclusion was to replace the turbo.
Id have enough, and took the car to another specialist and then decided to get the turbo rebuilt. The car was also showing faults with the esp module, thinking the 2 things might be related the module was replaced. This did not cure the fault, we then thought backpressure may be an issue, due to blocked cats, these were removed.
In the end I decided to remove the egr valve, I found it was totally blocked and very mucky inside.
George clearly did not replace it, this cost me around £3-4k.
As Nav has mentioned already, when I got my car back the tv had been messed around with and there were ice cream wrappers in the door pockets. The mileage had gone up, and the car always came back with the fuel on reserve. I had to get a full valet to get rid of the grease marks all over the interior.
George is a nice bloke, but needs a BIG lesson on how to run a business. George fraser as a garage are incompetent and have no respect for customers cars.