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I remember reading a FAQ on Google somewhere that mentions that to get listed under the UK pages:
1. Have a co.uk domain.
2. Be physically hosted in the UK. I guess they check know UK IP ranges here?
3. Have content on your website that mentions UK, ENGLAND, London and "UK" based keywords.
Point 3 suggests that you can have a .com address hosted in the US but still be listed under the UK pages in Google.
Cheers.
McNaz