A “prolific and chilling” sex abuser has been sentenced to 27 years.

David John Andrews, 55, with an address at Maghaberry Prison, pleaded guilty to 130 charges of sexual abuse.

He appeared at Downpatrick Crown Court charged with inciting children to engage in sexual activity, blackmail, sexual communication with a child and threats to kill.

The charges relate to 47 victims, 46 of whom were children at the time of the offences.

Andrews must serve a minimum of 13 and a half years before he is eligible for parole.

One of his victims has spoken to the BBC about her experiences with Andrews.

Claire, not her real name, was 13 when Andrews catfished her on Instagram and groomed her, she believed he too was 13.

“At first it was a friendly conversation and then it got more threatening to send photos, and in the end I did send them,” Claire said.

“He would threaten my friends and became very aggressive. Things got worse as soon as I sent them, he was asking for them near enough every day, and I was sending them,” she said.

When Claire stopped sending pictures to Andrews he threatened her, promising he would share the images with her friends and school.

“He went through my list of followers from my school and friends, and he sent them to those people. The photos were then sent all around school,” she said.

“It destroyed me, I left school for several months and I never went back fully. I was suicidal, self-harming every day. It closed in on me a lot, it destroyed a lot of my family bonds, I lost almost all my friends. I blamed myself.”

Claire’s mum has also spoken to the BBC about the crimes against her daughter.

“It makes you feel like you’ve failed as a parent. She was in her bedroom scared and sending these pictures because he was threatening her and I knew nothing, if I’d know I could have stepped in,” she said.

“After it all came out we had to set alarms in the night to make sure she hadn’t done anything to herself. She just blamed and blamed herself.”

Claire says that the repercussions from Andrews’ actions stayed with her for years.

“No one could help me, I was too far in my own head, I didn’t want the help, I thought I deserved what had happened to me,” Claire said.

She’s waited over four years for Andrews to be sentenced: “It’s been a long and tortuous process getting the case to court. I feel like I’ve been locked away. I can’t go out like a normal kid and have fun. I’m constantly waiting for the next phone call to say what’s happening,” she said.

“I hope I can finally close a lid on this part of my life. I’m still not mentally stable, I don’t think I ever will be. I was ashamed but in the end it’s not your fault, you’re a victim. It took ages for me to think it wasn’t my fault.”

Claire’s mum has a simple message for other parents.

“As a parent this has been devastating. She’ll build a life but this will always be there in the background.

“To other parents I can only say, check their devices, and if your child comes forward to tell you something believe every word they say, some people wouldn’t have believed this story, but every word turned out to be true.”

If you have been affected by the issues raised in this story you can visit the BBC Action Line for support.