Hi Kev its normally a software delete solution for the EGR as blocking it will throw an EML try unplugging the EGR and running it, from experience the EGR is monitored but only chucks out a code when the valve is well and truly stuck so the control unit cant open or close it, I had this on one of my Mondeos where I fitted a new turbo and within a couple of months it was throwing up codes for sticky vanes, I enquired with the company I purchased the unit from and they came back with its the EGR leaking, the EGR was only 15 months old but I changed it anyway and shoved a can of cleaner through the turbo and it all stopped, I later took the old unit and poured white spirit in to the valve chamber and sure enough it leaked through and considering red hot gas is no where near as dense as white spirit it must have been pouring through the tiniest gap, but no codes, Delphi/Wurth are excellent softwares.
Steve.