As stated in Prevent duty guidance:
The Counter-Terrorism and Security Act 2015 contains a duty on specified authorities to have due regard to the need to prevent people from being drawn into terrorism. This is also know as the Prevent duty.
In March 2015, Parliament approved guidance issued under section 29 of the act about how specified authorities are to comply with the Prevent duty. Specified authorities must have regard to this guidance when complying with the Prevent duty.
Two versions of the guidance were approved: one for specified authorities in England and Wales, and one for specified authorities in Scotland.
Is there any evidence to suggest that this has been successful in lowering radicalization since it began?