Thanks for all the advice. I really am just looking for the easiest and most cost effective way to manage this. I do understand now, however, the need to keep the personal and business matters separate and the complications that would arise from not doing so.
That said, if I am understanding correctly, I do business and file accordingly in the respective locations as such:
1. USA - I accept the US client monies into my US personal account and it doesn't come anywhere near my UK LTD Company. Then file with Uncle Sam as a self-employed freelancer.
2. UK - I withdraw those monies from US personal account into UK personal account for the purposes of my personal expenses (rent, food, etc - I have very little overheads / business expenses anyway, and most can be billed on US services, on a US credit card, which I have). Monies transferred from the US **personal** account to UK **personal** account will already be claimed as taxed in the US when I do my UK self assessment tax returns.
So essentially, act as a freelancer in the US and in the UK, use UK my limited company for UK based business only.
Am I wrong in assuming this would be OK to do without any tax confusion?