detention custody officers and two managers, and placed five other members of staff on restrictive duties, pending investigation. In addition, a former G4S officer, now employed by the Home Office, was also suspended. He was later dismissed from the Home Office, but a criminal investigation by the Crown Prosecution Service found that there was insufficient evidence to charge him in relation to the alleged assault. G4S said the staff suspensions were a "precaution" and advised the BBC that it had reported the allegations to "the relevant authorities". An internal inquiry carried out by the Home Office's Professional Standards Unit found that the treatment of one of the detainees who, having previously been a victim of torture, was suffering from mental illness and was suicidal, amounted to "inhuman treatment" which "did not involve proportionate use of force and was not in accordance with any approved control and restraint technique". In addition, the report identified that there had been collusion by G4S staff not to record the events. In May 2018 the High Court of Justice gave the detainee, and another individual who had been held at the facility, permission to seek an independent public inquiry into claims of systemic abuse by G4S. In June 2019, after a high court judge ruled that a public inquiry would indeed take place, Tulley told The Guardian newspaper: “In the two and half years I spent inside Brook House … I bore witness to the repeated mistreatment of some of the most vulnerable people in our society. Some detainees were driven to drug use, self-harm and suicide attempts, while others were victims of physical and racial abuse from staff. It’s been hugely frustrating to be told the mistreatment we worked so hard to expose has not yet been adequately investigated, and for those involved, justice has not been done. So it’s encouraging that with a full public inquiry likely to take place, those responsible for the abuse may be held accountable, and detainees in this country may face a safer, stronger system in the future.” In May 2018, the Independent Monitoring Board's annual report identified a "spike" in violence, both detainee-on-detainee and detainee-on-staff, an attempted escape, and protests against removals during the preceding year, and noted that staff had used force against detainees more than 300 times, twice as much as the previous year. In the same month, the Home Office extended G4S's contract to