A senior Metropolitan Police officer who suffered a mental illness after years of witnessing trauma says the impact of horrific events such as the Manchester attacks on the emergency services has yet to be fully understood.
"We ask police to go to the places the rest of us couldn't or wouldn't and we ask them to do it repeatedly," Ch Supt John Sutherland tells the Victoria Derbyshire programme.
"For 25 years I've watched colleagues do those things with extraordinary compassion and they do it so beautifully, but I don't think we've even begun to understand the impact it has on them to be exposed to repeated trauma."
In 2013, after years serving as a frontline police officer, Ch Supt John Sutherland began to feel unwell. He went on to suffer severe anxiety, depression and crippling exhaustion.