Morning all. New member here. The airflow into the cabin has been quite reduced, so I checked the pollen filter - very dirty! Time for a new one Main dealer was shut, Halfords couldn't help but I managed to get one from a small parts supplier. Result - much improved air flow. This new filter is not a carbon activated type - just a straight filter. Anybody see a problem with this? What is the purpose of the carbon in the genuine type? Thanks.