AnyToyota and/or turbo specialists in the area?

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Mother-inlaw has just got herself a Toyota Previa turbo diesel which could do with a look over by someone knowledgeable. Does anyone know of any Toyota specialists in the area (Ipswich-ish ideally) that might be suitable aside from the main dealer?

Also her turbo is pretty noisy to say the least...not sure if that's factory standard as there's none of the tell tale signs of smoke out the back at any point, but it makes more noise than my old 944 turbo and Mazda 323 turbo whine put together! Anyone know a decent turbo specialist in the area too?

I have no experience of the main dealer in Ipswich but a quick search on the Toyota owners forums isn't exactly bathing the entire network in glory hence my above questions.