When I put EX1 in it gives a long list of postcodes beginning EX11 etc same as Andrew cannot click underscore without clicking on magnifying glass. Mine is definitely version 12 as I had same trouble with dealer as you Lons.
I remember not long ago when with the BMW sat nav you could only put in 6 digits not 7, sat navs have improved a lot over the years.
2017 GLC AMG43 premium plus, night pack, leather, intel lights, 360 camera, side steps. = sadly gone
Now GLE450 Premium plus, Selenite, Black/White Nappa leather, Tech plus pack, Driving assistance pack, Tow pack, Off road pack, 22 inch wheels.