Got it to work eventually
So I went to this site -
http://webspecial.volkswagen.de/maps/int/en/index.html(This
didn't work for my Discover Media VW SD Card -
I downloaded the DiscoverCare program. This program said that the there were no updates available.
I went to the next page, did the backup, then the download which took hours, then the install which failed near the end.
)
This
did work for my Discover Media VW SD Card -
I downloaded the European Countries, Bundle 1, 17/12/12 update.
Then I dowloaded the 7.zip program near the bottom of the updates page and installed it.
I copied all the data off my VW SD Card into a folder on my computer. So the card was empty.
Then I clicked on the update file with my right button and used 7.zip to extract the 'MAPS' to my SD Card.
Remember to lock the SD Card again.
Now the Navigation info says 2018.
Note: as with any update you do so at your own risk!