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Receptional_Andy - 10:05 am on Jul 31, 2008 (gmt 0)
4 com.au sites in "pages from the UK" [google.co.uk] I think a number of Wikipedia servers are physically in the UK, incidentally. [edited by: Receptional_Andy at 10:07 am (utc) on July 31, 2008]
I don't think the problem is that widespread for AU/UK results though. I currently see only a tiny percentage of mismatched sites:
8 co.uk sites in "pages from Australia" [google.com.au]