HuskyPup - 10:56 am on Jun 18, 2012 (gmt 0)
Having written that it's not the answer you are seeking.
I assume you want to host a .com in the UK? I have quite a few domains all running under a mixture of .com/eu/uk/cn/in/asia/etc and all hosted in the UK.
They all do well in the markets they represent, the .in does especially well because English is a subsidiary official language and is very widely spoken and used at many levels, especially business.
The .coms single-biggest traffic sources have always been the US with about ~40% of overall traffic, in comparison the UK is about ~5% of the overall traffic.
Is this a well-established .com site already ranking well? If so I doubt you would have many on-going ranking issues in the US however a new .com launched from the UK may find it very slow to gain a foothold in the G.com SERPs.