Yes, stupid of me; I read your original post and forgot about it. Thanks for reminding me. A few other people in Britain have said on the speakev forum that they have the update and I'll post the gist of yours there for interest's sake.
It's a pity that the update doesn't have a reference of any sort, I think; the only indication seems to be the copyright 2016 statement.
Are you talking about the Google Maps copyright? If so that's not the same as the Navigon maps update date which, as far as I know, is not visible to users like us.