What happens when someone in the US clicks on a GB itunes URL? If I provide a GB url itunes link to an app, say 

https://itunes.apple.com/gb/app/id586088546

what would happen if someone in outside the UK, say in the states clicks on that? would it work or would it redirect to a version on their regional app store?
The view from Chicago is below. The prices are in GBP. When I click on the View in iTunes link, the prices change to USD.

Staying in my browser, if I change gb to us in your original URL, the prices change to USD but everything else seems to stay the same.