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If I was you I wouldn't take the risk, i have had a few clients have this as an issue in the past. As I don't know your link profile I can't say for sure but a good link profile should be made up of all different types of links. The risk here is these links are not earned in googles eyes or in some cases other websites don't know they are giving the link back to you. I always work off the idea that if I feel like there is a risk it's not Worth it. You might get away with it from a algorithm point of view but you just need a manual review to happen and it's going to be a lot harder. Wish you the best of luck with it.

Hi Keith, In my experience Google mainly crawls from the US. You're quite right, GeoIP redirection can cause major issues with indexation - as if you're redirecting everything from the US to the .com googlebot can't see the .co.uk site. As such, I'm not a fan. Rather than implementing a hard redirect I prefer Amazon's approach. If you visit the amazon.com site from a UK IP you get a javascript overlay that invites you to visit the .co.uk version of the site instead - they let the user decide which site to view rather than actually redirecting them. This is a nice solution as it ensures that the search bots can crawl both versions of the site, and rankings aren't endangered. I hope this helps, Hannah