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I notice also that there is a link on the UK site to visit the .com one, which has an address of the form google.com/ncr - this alone will get me to google.com (though the 'ncr' suffix doesn't appear in the address bar. Frames? Cookies?).
What's more, I noticed that typing just "google" into Firefox 1.0 adds to the address, so it becomes google.com/webhp?sourceid=firefox - this does not happen in Opera 7.54u2.