The Manchester Arena terrorist attack in 2017 left 22 people dead and more than a thousand injured. The subsequent inquiry found security arrangements were lacking with some security staff admitting they were untrained in vital procedures. File on 4 goes undercover to reveal how, despite assurances the industry has tightened up procedures, some training companies are offering 'fast-track' courses which don't comply with regulations. the programme also reveals how candidates are told to falsifty time sheets and are given the answers to a final examination to ensure they pass and can subsequently work in an industry which is supposed to keep the public safe.