Thanks for the reply Andy. It's at the BMW main dealership in Blackpool. They've run diagnostics and said the vacuum pump is absolutely fine. They've also inspected timing chain guides and checked the oil pickups from the sump are clear. Which they are. Now they want another 300quid to adjust the timing which they have no reason to believe is out. Absolutely nightmare. Think I'm going to pick the car up and start diagnosing myself. I know my way around a car so not afraid to try any suggestions people may have, providing it doesn't require the engine removing or car putting in the air.
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