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I get perfect results for .com site: search but a total mess for the same search but with the uk only option, this is the first result
www.google.co.uk/products/reviews?fq=&cid=178da50754e4299a&sort=2&q=%22people+found%22&sa... - 20k - Supplemental Result
Ping google.com - 188.8.131.52
Ping google.co.uk - 184.108.40.206
EDIT: This is the same with Firefox or IE, logged in or logged out.