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

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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.

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”. Lee Amos was put away for 35 years for a catalogue of crimes - including murder (Image: PA) Read More Related Articles To add credibility to his cover story, he worked alongside Nikki, a fellow Level 1 covert operator who dressed up in Gucci and posed as his girlfriend. 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”. And the plan worked. Over the course of a year Doyle became known around Moss Side and Hulme and became a regular drinker in the area.Shay Doyle 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. It was like I'd vanished. I was given a new passport, birth certificate, driving licence, bank cards, credit cards, all the essential documents for a new identity," said Doyle in a interview with the Star. "I learned how to make cutting ­charges to blow a hole in a wall and how to breach the skin of an armoured cash van with a shape charge. I was discharged from the police force due to mental health issues. I was still relatively young, but I was struggling with PTSD.

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."The rise and fall of Dominic Noonan, the paedophile gangster who once ruled Manchester's underworld Nor does he view his own disillusionment as an isolated case. "Many officers in undercover policing walk away with a very bad taste in their mouths. READ MORE TRUE CRIME:• The violent rise and fall of gangster 'White Tony'... devoted Winnie Johnson's other lost boy It wasn't long before Shay's prodigious talent caught the attention of the top and he was called upon to join the secret Level 1 undercover unit, Omega. He was given a new identity and his DNA and fingerprints were removed from the national database. I’d spent my life at the sharp end, chasing gangsters. Feeling the adrenaline of going through the door, the rush of a big arrest. All that was gone.”