Contacted dealer where I bought my car 1.6HDi and they suggested high revs @ 40 mph for about 10 mins.
Has anybody actually had the dpf light come on? Mine never has & my driving is mainly town & local rural rarely above 50mph for more than a few miles with a long motorway run every month or more. The problems seems to affect certain makes, never heard of it with Citroen. Technology does not stand still & presumably this problem will be resolved sooner or later.