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No best answer has yet been selected by peter dann. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.The main dealer will have a better idea than me, due to the fault code that they can get from it, but I'd check the pressure sensor connections either side of the DPF (big catalyst bit)
Do you drive very slowly all the time (eg heavy traffic around town) if so, a blast down the motorway may help clear out the DPF if that is the problem.
It could also be a fault with the fuel additive dosing unit.