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However...in Aol.co.uk, any sites that aren't .co.uk domains, are excluded (even if they are UK hosted!)
Is there any reason for this and is there anyone I could contact?
I don't know whether this decision is from AOL or Google - hard to say. But since AOL is the website hosting the search, I'd probably start there with any complaints. Their "Contact" page offers a feedback form for Search.
This one surprises me. On the surface it seems like a real disservice to their users, especially when Google has the data available.