Deep Cover: How I took down Britain’s most dangerous gangsters

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READ MORE TRUE CRIME:• The violent rise and fall of gangster 'White Tony'... devoted Winnie Johnson's other lost boy I was discharged from the police force due to mental health issues. I was still relatively young, but I was struggling with PTSD.

After a stellar career undercover Doyle moves on to finish his police career after adding several major ,and dangerous,investigations to his CV. The rise and fall of Dominic Noonan, the paedophile gangster who once ruled Manchester's underworld I put myself up for the risky stuff because I felt I could do it and I felt I should. The police get such a bashing, but we don't hear about the every day, when a child is saved, or a vulnerable person is protected."I want to highlight mental health issues in the police force. Many police officers can’t put their hands up and tell people they’re struggling”. Before joining Greater Manchester Police he had served seven years in the Army, and knew how to handle firearms and explosives, and execute a plan with military precision. The soldier-turned-undercover policeman risked his life to infiltrate south Manchester's gangland. He was also on the frontline of some of the most high profile police operations in Greater Manchester history, including the Stepping Hill poisonings and the hunt for double cop killer Dale Cregan. Doyle is not his real name. He was given a new identity when he was medically discharged from the police in 2020 suffering from PTSD. Now in his forties, he feels he has paid a heavy price for his career. "I sacrificed my mental health for it," he says. Some of the practices adopted by those infiltrating the world of activism I find absolutely disgraceful," he says. "It's a different world to that of organised crime."

I'm proud of the work I did that kept people safe, that stopped them from being shot dead, that removed guns from the streets. That's what I signed up to do. Shay grew up on a tough Manchester council estate where drugs and gangs were rife. A life of crime would have been an easy path to take. So it went against everything that was expected of him when he joined the police.Certain things came easy to me, and I had an innate drive to succeed. Whatever field I went into, I would put myself up against more educated people, and it gave me fuel”.