Thanks for the suggestions. Will give that a try. As mentioned by 'Pardec', it idles fine and sounds normal diesel at idle. Pinking / knocking noise when pulling away initially and runs rough on light throttle opening at low speed.

Just wondering whether anyone has experienced this and has any suggestions: 56plate TD4 with 56k miles, recently acquired. I carried out a full service; oil change / all filters including fuel and crankcase breather / and have also installed an EGR blanking mod and a diesel tuning box. I...