The car works perfectly well (95k on clock) - no misfiring or sluggishness. If it is only 3 bolts to remove the EGR I might give it a clean. If I replaced with a new EGR would any software need re-mapping. Finally I will take it on the motorway, as you suggest. Since covid began almost stopped using it, so have not gone above 50 mph is two years - 150 miles in total. I will also delete the EGR error code and see if it comes back. If it is the camshaft, I got no way to check, then it would have to be goodbye. Incidentally the cambelt got changed at 75k miles.