Terrorist violence has a long history in the United Kingdom and the Government has a long experience in adopting the legal measures to counter the danger. It was the Irish terrorist activity, which started in the XIX century and continued almost till the end of the XX century, that caused the developing of a well – regarded competency in counter – terrorism in the UK. Nevertheless, the terrorists attacks of September 11, 2001 and attacks in Great Britain on 7 and 21 of July 2005 compiled the UK Government to change its counter – terrorism policy. The UK had to provide legislation which could deal with the new terror provided by extreme radical Islamic networks waging a global jihad. The UK Government started to deal with this new international terrorism, by introducing the new anti – terrorist acts in 2001, 2005 and 2006. The Islamic terrorist treat started to reform the institutions for domestic counter – terrorism and create new international relations among the CT activities of national governments.