Trading for income and taxes

Hi All,

I was just wondering if anyone is in a position to answer a few questions about making an income from trading.
Like many of you I would like to make an modest income from my forex trading and, although I understand I am nowhere near ready for that yet, I was interested if any of you are already in such a position as I would, ultimately, like to be.
I am a British expat working in Hong Kong and would like to remain as an expat, although I'm not too bothered about where.
If I was in a foreign country and making an income from trading with, say, an Aussie broker, where would I be expected to pay taxes on my income?
This is assuming that I am not working in the country I am living (visa issues aside).
Would it depend on where I hold the bank account that I am funding my trading account with? Does it matter which country my broker is in?

Any thoughts on this would be appreciated.

LG