Prevent strategy 2011
The Prevent strategy 2011 was published by the Home Office in June 2011.
It is a revised strategy paper to counter radicalisation and counter extremism. It aims are: "responding to the ideological challenge of terrorism and the threat from those who promote it; to prevent people from being drawn into terrorism and ensure that they are given appropriate advice and support; and to work with sectors and institutions where there are risks of radicalisation that we need to address." 
The paper sets the definitions of an array of terms that are used in future policy papers.
Extremism is defined as
- "vocal or active opposition to fundamental British values, including democracy, the rule of law, individual liberty and mutual respect and tolerance of different faiths and beliefs. We also include in our definition of extremism calls for the death of members of our armed forces, whether in this country or overseas."
This is the working definition in the "Tackling extremism in the UK" report; a report to block extremist websites in the UK.