you should of been told about it mate, but some dealers just want a sale. it used to be that dpf cars where said to be fine in towns, the rover city car for example. untill people bought the dpf one and found out if you dont do regens then it breaks and costs £1000 up wards for a new one.
I only do city driveing and every now and again a weekend trip on A and B roads and mines does regens fine, ive got near 3000 on the clock now. my mate has a passet that he only drives in town and rarely motorway, once in a blue moon he would drive on the motorway. hes had it now 4 years and hasnt had a dpf light on yet. I think they have tryed to make them town friendly by throwing more fuel in to get the temperature to burn off the soout in the dpf. as long as you do decent drives every now and again maybe once a month you do your drive to work, if your doing that drive every day then I reckon you should be fine.
when I read up on it the advice was to drive at 2k revs for 10 mintues to do a full regen, but that was after the light comes on to warn about the dpf being full. I normally clear mines doing 60 mph on the back roads every other weekend while driveing to a trip out for the kids. im sure if there are any specialists about the topic will be able to go into greater detail for you.