piatkow - 10:34 am on Nov 3, 2012 (gmt 0)

@pdinis
Different EU countries have different laws about setting up business.

In the UK there are no special registration requirements but I would recommend finding yourself an accountant and getting up to date professional advice from him. Do be aware that once HMRC get it into their heads that you are self employed they won't let go if you go back to working for somebody else but will chase you for self assessment for years after you stopped trading.