Just spent the best part of a day cleaning out the particulate filter on my 140k 05 plate 407 SW 2.0hdi using Zooanki's 307 guide as a basis (thanks!). What an epic! Ended up splitting the filter from the cat. under the car and couldn't disconnect the rear pressure sensor pipe which is now slightly loose in the fitting and the nut almost rounded off. The filter had a layer of black soot on the end which had virtually blocked it. After cleaning and reassembly and a couple of short journeys, the filter blocked warning symbol is coming on and the car is running lumpy. I suspect the first bit of advice will be, "Rip it out!", but other than start spending too much money, any suggestions about what might be going on?