What it's like to go undercoverTo play this video you need to enable JavaScript in your browser.This video can not be playedWhat it's like to go undercoverCloseWatch the full Panorama documentary on BBC iPlayer here.SectionNewsPublished1 OctoberShareclose panelShare pageCopy linkAbout sharingRelated topicsPolicingFollow Policingclose panelYou are now following PolicingUpdates from your News topics will appear in My News and in a collection on the News homepage.Read description