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Yes, but as you've blocked them now they won't (shouldn't) get reindexed. So you've already taken care of permanently. Using the tool will remove them now and then you've done the rest.

I have an additional question, that I haven't been able to find an answer for elsewhere. How does Google determine which version is the right one to show for each user? Is it by IP? I mean, in my example we could have an american user that is on vacation in UK. Would he see the .com or .uk result? It could also be a norwegian user on vacation in Denmark, would he see the .no or .dk results? (danish and norwegian is fairly similar and has a lot of common spellings).

I will investigate with our developer what we can do to prevent this from happening.

Already done. They also included the tip in their newsletter for beta-testers.