DPF issues should not affect you with your driving habits. I am in the trade supplying products to overcome DPF and Turbo problems/issues amongst other things and have never been asked to solve a problem with your type of mileage. It's the SAS vehicles (school and shopping) where there are many DPF issues.
Excellent thanks. I know they had improved a lot, and the car salesman said it should be OK - but he is a car salesman !