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The charcoal filter is only in US spec cars.
They are are there to absorb any fumes the escape from the intake plenum or crankcase breather (typically when the engine isn't running and the car is sitting). Actually they have only been added to US models to pass CA emission testing , but BMW wanted to sell a 50 state legal model rather than having a CA specific model.
As you're in the UK you will not have them in your car
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