I had symptoms similar to this a few weeks ago when my mums St tdci injectors became damaged due to contaminated fuel that we brought from a well known "every little helps" supermarket resulting in a AA recovery from the m6 toll services up to her home in North Yorks...although I had different fault code p0251! Ive heard that for reliability there very fuel dependent so 99% of the time all of our mondeo tdci's are run on bp or shell... the only time we didn't on this car the injectors shat themselves.....my mums st has also only done 81k on a 05 plate. Our 130bhp tdcis have done 160k 155k and 75k and all are run on Branded fuel 90% of the time and all are on original fuel pumps injectors as we get a good discount at fords all are serviced with ford filters