Tax in the UK

[ToWW]

Hi,

I live in The Netherlands and was looking into the tax situation in england. From what I read on the website, you either need a job or got to prove that you have enough money to stay in the country.
Anyone got an estimation what qualifies as 'enough money'?

My actual question is, if I move to the UK, I guess I have to still pay taxes to my own country for a while. How long does it take to become a UK citizen and pay taxes to the UK government? (I'm playing poker fulltime obviously).

I hope anyone knows this or can link me to a good website/thread where there's good info about this.
(or is it not possible to become UK citizen even for an european when you play poker fulltime?)