Major Roads of Europe on tom tom go

i have a tom tom go for the uk it has a 128 sd card with uk maps with it
on the cd that came with it is the Major Roads of Europe how do you get them on the card with the uk maps or do you have to get a new blank sd card to copey them to .

[Stevie]

You would need to get a larger card, if am right i think it would be 256SD required.