Under Uk law and according to the reforms introduced in parliament after the 2010 election, namely the Financial Services Act 2010 (FCA) ,The Financial Conduct Authority (FCA) is now the City's behavioural watchdog regulating the banks, stock markets etc and the Bank of England has also gained direct supervision for the whole of the banking system through its powerful Financial Policy Committee (FPC). As it stands currently, the FCA seeks to regulate exchange points where people sell or buy crypto currency with fiat. Consultation papers have suggested stricter AML (anti money laundering) and KYC (know your customer) laws. As to the issue of ICOs, you can be sure that if an ICO defrauds any one within the UK's jurisdiction, it is a crime under the common law and you can be liable both in criminal and civil court. If there's no fraud, then as it stands today, it is a grey area leaning towards legality (as there is no law/ direction banning it).
thank you for nice answer
i do believe that most of uk company which got real product will never try to scam their investors
Royal mint is example : they are on the way ico their coin to market
another question i just want to know : for now ICO should be ok with UK citizen but in case of FCA will follow SEC and want to change the law in the future . then they could chase back all previous ICO or not ?