Why is my Volkswagen Passat juddering when I start it?

I have a 2010 Volkswagen Passat CC automatic diesel. It's started to judder when I start it. Any ideas what it could be? It's driving me mad.
Reads like the wet clutch pack in the DQ250 6-speed DSG. This is due a fluid and filter change every four years or 40,000 miles whichever comes first.
Answered by Honest John

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