Two independent reports by Hampshire Constabulary and North Yorkshire Police criticised the decision to return his firearms, which prompted the IPCC to launch an independent investigation. This investigation concluded in February 2016 and it published its findings in a 73-page report in April 2017. IPCC associate commissioner Tom Milsom said: "Our investigation paints a deeply concerning portrait of how Surrey Police's firearms licensing team operated at that time. We found a unit which lacked the necessary training and processes to manage such a serious responsibility, staffed by individuals who were failing to undertake their duties with rigour and due consideration."