Hi Rowley,
I have a 2008 diesel auto facelift model 2.2 litre. Now done 95000 miles. no problems with the DPF and just beem MOT`d.
I do drive fairly long fast open country routes most of the time, but if I feel I have been doing quite a bit of town driving, I put it in manual mode and take it for a blast.
Lovely car. Hope this is helpful.
Cheers
Rod