I've tweeted at VW a few times and what they've said has been right so far, but they are referring me back to the dealer each time I ask for specifics. Sadly the specifics (which boat, firm ETA) are either unavailable to my dealership or they don't want to tell me (suspect the former).
I'm thinking of giving it until Wednesday next week - as I was advised by my dealership that there is definitely a boat scheduled from Emden to Sheerness for then - and if the tracker doesn't update I will be giving VW a call to chase them because it will have been built for several weeks during which multiple Sheerness-bound boats have departed from Emden.
Of course once it arrives and is ready for me to collect all this waiting and frustration will just melt away!