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A UK address in the whois is something I've noticed does seem to work, at least it has in the past.
would also make sure you have lots of on page content relating to the uk including possible uk related resources and references
I rank reasonably well for all the search terms I want to, but feel I could push it up a notch by a TLD change.
I don't target 'UK' as a keyword but I have noticed a difference in google.co.uk and google.com results for phases like 'widgets in essex'.
Other than ensuring a correct 301 redirect should I be aware of any potential pit falls?
As mentioned above, it is important to determine whether your UK webhost is indeed hosting your sites in the UK. 1&1 UK, for example, use servers based in Germany.