The "correct" map for your device would be City Navigator Europe
NT, but it's at the moment only available in version
2014.40 from February of this year.
But there you find West Europe or UK+Ireland as ready to use unlocked image including the suitable JCV.
You can also take the brand new
Unicode version NTU 2015.20, but there you have no suitable JCV, because this version isn't intended by Garmin for your device. We hope that the "normal"
NT version 2015.20 comes soon, but nobody knows exactly.