I spent weeks on this issue too. Its not just mint10 - it occurs on any OS your using. Google thinks they know best and will only serve us the country that relates to your IP.
Anyway - i finally found a plugin at firefox that changes the default to what ever i want. AND if i want to search on google Canada, AU, UK, Ireland etc. I just use the plugin and it will fire off the same search you just did but will show the results in the country you selected.
Its called "Google Global Options"
Hope this helps. Now i need to ask how on earth to upgrade to firefox 12 - i too am using Mint10 and its not showing up in the mint update panel. FF11 did but been waiting for FF12 to showup