Have a look at the the chart in post #1 here ..
http://www.navitotal.com/forums/showthread.php?5502-All-New-Maps-870.XXXX... and choose a map that suits your TT and Navcore. A Western Europe map will give you UK-Spain (door-to-door) routing.
Read the tutorials, which you'll find in the appropriate section, very carefully. If you have an unpatched Navcore (i.e. an original TT 'official' one) then you'll need to patch that as well as the map.
Macca