"My problems though are solely at start unlike yours which seemed to cause roughness etc in ordinary driving. "
Sorry, I think I may have misled you ………… the problem last year was awful starting with clouds of smoke - that was the 'blocked intake pipe on the EGR system' - whatever is meant by that. There were no fault codes showing, and I was surprised to find that car was fine after about half a mile when I drove it tentatively down to the garage. Like yours, it started and ran fine when it had warmed up - this is what was so confusing at the time. The symptoms could only be duplicated after the car had stood overnight to cool down.
The problem this year was slightly rough starting and running - and there was a warning light with fault codes. This was cured by replacing the glow plugs and the EGR valve.
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