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The DPF light has come on in my car despite doing lots of miles - why has this happened?

I have a 2008 BMW 3 Series Touring 3.0d. I do 20,000 miles per year on A roads, at high speeds, and change the oil and filter very regularly. A diesel particle filter warning light has now come on. Why has this happened as the car has only done 89,000 miles?

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The DPFs on these often fill up with ash from around 80,000 miles after which the DPF cannot passively or actively regenerate. I think you either need to send the DPF to Ceramex to be chemically cleaned or replace it (£400 - £1200).
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