idle judder on cold start up

It only seems to do it in the morning and then only somtimes, the engine seems to have a bit of a shimmy at idle (extra diesel shake) it's fine while running and not noticed in the evening,.

It's feels like fueling to me (changed filter last week to make sure it's not ****e in the fuel system), no faults logged and runs fine on the move.

A good few years ago I had a Renault megan 1.9DT (Briefly and never again!) and that did the same and I ended up replacing the fuel pump.

Ive had a search but only seem to find DMF issues, unless this is the first sign

anyone expienced this on a CR Tdi VRS?

Cheers