Hi StevieJ, when I ordered my Cactus last year I managed to follow the car on it's journey from Vigo to Sheerness. It takes a bit of searching to do so, but what I did was when I received the email from Citroen saying that my car had left the factory I used http://www.marinetraffic.com to track progress and centred it on Vigo port.
I then searched over a couple of days for any car carrier berthing there and then checked its onward destination. If you are in the UK then the ship travels in a basic loop of Vigo - Zeebrugge - Sheerness - Vigo. At that time it was the Baltic Breeze but has obviously been changed as she is currently at sea near Greece.
I actually watched the vessel berth 4 days later in Sheerness courtesy of the http://www.Fleetmon.com AIS system and then called at the dealership later in the day to tell them that the car had arrived. They seemed surprised that I could know, however on checking the system confirmed that it had just arrived and had been logged into the distribution centre and was awaiting delivery.
Really pleased that I decided on the Cactus and am getting a constant 70mpg+.
We've not had any emails from Citroen since we ordered it. We only found out it had been built when the dealer called us.
Can't wait to finally get it, been seeing more of them around our area lately but I haven't seen one exactly like ours fortunately.