The mother logged into a web chatroom pretending to be her 13-year-old daughter and arranged a meeting with pervert Philip Brown. Once she had his mobile number she handed the details to police who then arrested the sex pest.

When they later examined his personal computer they also found 10 images of child pornography.

Yesterday (August 11) at Leeds Crown Court, 29-year-old Brown was placed under a three year supervision order and put on the sex offender’s register.

Brown, from Graham Drive, Airedale, Castleford, must also complete a three year programme designed to “rehabilitate” sex offenders and undertake 250 hours of unpaid work

Judge Scott Wolstenholme praised the mother’s “vigilance and resourcefulness” in helping to snare Brown.

But the mum, who cannot be named, was furious.

She told the YEP: “I’m disgusted. I don’t believe that (the course] will do any good for him. Once a paedophile, always a paedophile.

“It makes me feel sick to the stomach. Although he never got as far as meeting my daughter, I feel like he has taken her virginity because she sent him photos of her naked.”

The court heard how in June last year, the mother discovered naked photographs of her daughter on the family computer.

When quizzed the youngster admitted she had been asked to pose for the pictures by a man to whom she was chatting online.

That afternoon, using the girl’s password, the mum went into the internet chatroom Netlog.

Posing as her daughter, she quickly tracked down Brown, who was using the screen-name ‘Baz Bingham’.

She arranged to meet him at a Glasshoughton supermarket and took his mobile telephone number.

After he was arrested, Brown admitted he had spoken online to girls he knew were aged between 13 and 16 and asked them for photographs.

He also said he had sent snaps of himself naked and performing a sex act.

He claimed he did not get “sexual gratification” from the pictures but that they “made him happy”.

Brown admitted one count of attempting to meet a child following sexual grooming, 10 counts of making indecent images of children and one count of possessing indecent images.

James Littlehales, defending, said if Brown was sent to jail he would not receive help and the court’s limited sentencing powers would mean he could be free within nine months.

Judge Wolstenholme accepted his argument, but told Brown: “My priority is not to show mercy to you but to pass a sentence that will do the best to protect the public from you.”