With official approval a Muslim community informer for the British Security Service (MI5) was interviewed by BBC Radio Four Today programme. You can listen to the short six minute podcast:https://audioboo.fm/boos/1819839-the...unity-informer

The initial approach to him was made by the police, so the person may not be an MI5 informant, but one run in concert by the police and MI5. He repeatedly refers to the role as providing clarification on a person, whether they are linked to extremism.