I drive the same model as you and I've got a Europe 2011 version in mine which I bought from satnav- updates who it seems are no longer trading. I'm led to believe its a Kenwood unit but there's no model number to be found anywhere and nothing in the satnav manual. Have emailed Kenwood to see if they can throw any light on it - will keep you posted
Believe that company may have started up again, www.satnav-update.com and are advertising a 2011-12 disc. Have emailed and await a response.