Undercover police officers have been filmed for the first time posing as paedophiles as they snare child sex offenders in a shocking new documentary.
Channels 4's extraordinary new three-part series has gained unprecedented access to some of the most secretive units in modern day policing.
Undercover Police: Hunting Paedophiles is three years in the making and follows a raft of high-profile vigilante 'paedophile hunter' stings snaring hundreds of child sex offenders.
The explosion in online child sexual abuse has worsened during the pandemic, with reports of obscene material more than doubling to four million globally during the first month of lockdown in 2020.
The series will follow “Simon” as he goes online offering his 10-year-old daughter to abusers - but in reality he is an undercover police officer who spends his days trawling chat rooms as he hunts down paedophiles, The Mirror reports.

The covert operative said: “Simon is completely fictitious, he's a character. When I go in to role and deploy he comes out of a box and he's like a skin that I put on.
“It's quite disturbing portraying yourself as an adult, male, paedophile, but it's such a good technique for catching people who are seeking to abuse, hurt and rape children.”
Speaking ahead of Channel 4's ‘Undercover Police: Hunting Paedophiles’ Simon Bailey, the National Police Chief 's Council spokesman on child protection, called on big tech firms to take responsibility for the huge surge in abuse, with police "overwhelmed" by the number of cases.
He said companies like Facebook are "not doing enough" to prevent the uploading, sharing and viewing of child abuse images.
"I don't think their role in all this has been truly appreciated because without them the abuse wouldn't be able to take place in so many cases," he said.
"It's the big market leaders that actually bear responsibility for making sure the internet is a safe place for our children and for our grandchildren to go. And ultimately at this moment in time it's not safe."
Mr Bailey blamed the "staggering increase" - from 7,000 indecent images of children in 1990 to 17 million on the child abuse image database now - on the development of the internet.
The film follows the officer as he exchanges sick messages on the children's section of an open website called Chat Avenue.
Spotting that abuse videos are openly being sold on the site, Simon says: “It's not even hidden is it? You'd think it would be a bit more covert, but this is in a child's chatroom.”
Later Simon deploys to the dark web where he sees images of a baby being tortured, causing him to stop work and take advice from his controller.
He tells her: “I'm feeling a bit choked now talking about it.”
His manager says: “You remember what you have been seeing and that's real life. What you don't want is you going home to your family and kids with that playing in your mind.”
Mr Bailey warned parents to keep a close eye on their children's internet usage.
He said: "I could describe to you some of the most horrific videos where you can see a child that's been groomed, abusing themselves within their own bedroom and you can hear their mother calling up and recorded on the video, 'darling, dinner's nearly ready,"' said Mr Bailey.
"Now that is pretty horrific, I think, in anybody's estimation."
- Hunting Paedophiles - Tonight on Channel 4 at 9pm