Back on the thread topic......
JohnD and Eyetee, have a listen to Dean Clifford on Global FACT Radio. He is years ahead of many on the income tax con. Global FACT have recently started a weekly show where he covers it in quite a bit of detail.
You'll need to start looking at contract law and trust law to have a better idea how to challenge where HRMC are with your 'Person'. It's a minefield and not something you can stroll into without learning a hell of a lot. Personally I have to read /listen to info on law 5 times before it starts sinking in!!