 What is Prevent? Prevent is part of the UK government's counter-terrorism strategy and it came around after the tragic 777 London bombings but a significant change came about in 2015 when it was made a statutory duty for all public sector employees. So, you know, basically we brought in social workers, teachers, doctors, university, etc. So suddenly their workplaces became potential areas for identifying people and children as well because don't forget this, the strategy bizarrely starts from nursery school onwards. So basically the government says we need to kind of find these people before they become violent, yes, essentially. So who are the people expressing extremism? So the problem with that obviously you can see straight away is that there's a very wide spectrum.