An evil paedophile who filmed himself raping a toddler in a nappy has been jailed for the "most serious" cases of child abuse.
Sick Robert McGregor, who filmed his horrific attacks and made videos of it for others to watch, was jailed for 10 years today after grooming and exploiting youngsters for 13 years.
He was caught with a cache of child pornography by police which led them to identify three victims he had sexually assaulted, the Daily Record reports.
In video footage McGregor was seen raping one distressed boy who repeats "no" and "don't".
The 36-year-old also shot film of a three-year-old with his nappy undone as he raped the vulnerable little boy who had no speech.
He also recorded footage of a victim almost being physically sick after he perpetrated a sex act on the boy whom he subjected to years of abuse.

Robert McGregor who has been convicted of child abuse offences
Robert McGregor (pictured) was convicted of a series of child abuse offences 

A judge told McGregor: "Your sexual offending is of the most serious and appalling nature."
She said that McGregor's youngest victim was "extremely vulnerable".
The judge said that the material recovered in the case not only demonstrated what he had done but that he had persisted in it despite the obvious distress of victims.
Lady Carmichael told McGregor that she would have jailed him for 15 years but for his early guilty pleas to the catalogue of offences.
The judge also ordered that he be kept under supervision for a further five years on his release.
Lady Carmichael said she was not satisfied that the risk criteria were met for imposing a life sentence on McGregor under an Order for Lifelong Restriction.
One man branded McGregor an "animal" as he was led off to start his sentence.

Robert McGregor who has been convicted of child abuse offences
The judge said McGregor (pictured) was a danger to society 

The child abuser's home was raided by police in May last year and laptops and other items were seized for analysis.
Advocate depute Jo McDonald said a search warrant was granted to police after intelligence was received from the National Online Child Abuse Prevention Agency.
More than 2000 indecent photos and 899 videos were recovered many of which were found to contain material at the most extreme level of abuse.
The prosecutor told the High Court in Edinburgh: "Some of the images showed children who appeared to be as young as 12 months old."
Some of the videos were found to feature McGregor raping and sexually abusing three victims who were later identified by police.
McGregor had uploaded five videos to a peer-to-peer internet app which allowed others to view the footage of his abuse of one of his victims.
Police computer experts found that the files had been accessed by users in America, Germany and in the Czech Republic.

McGregor was guilty of sickening abuse 

McGregor, a delivery driver, made an initial court appearance charged with possessing indecent images of children and was freed on bail but was then assaulted.
Following further police investigations it became possible to identify one of his victims and he appeared again in court facing further charges, including child rape. Bail was then refused by a sheriff.
McGregor subsequently pled guilty to six offences when he appeared at the High Court admitting three charges of raping three boys, sexually assaulting one youngster, making indecent photos of children and distributing or showing indecent photos.
His sex assaults on children spanned more than a decade between 2001 and 2014 and all the attacks occurred in the Inverness area. His youngest victim was aged just three.
Another boy was subjected to nearly a decade of abuse from the age of six and the third child victim was 12 when McGregor assaulted him.
The child pornography offences took place between 2011 and March last year.
The advocate depute said that McGregor's offending had had a profound effect on some victims. She said that the scale and nature of his crimes has "scarred families for life".
Defence solicitor advocate John Keenan said: "On any view this is an extremely serious catalogue of offences in a variety of different ways."
Mr Keenan said that it had to be acknowledged that McGregor's crimes had had "a significant impact" especially on his two older victims.
He added that "mercifully" the youngest victim appeared to have no recollection of what happened.
The defence lawyer said McGregor seemed willing to take part in programmes to address his behaviour and it was considered that if that happened it would lessen the risk he posed.

Edinburgh High Court
He was sentenced at Edinburgh High Court 

A spokesman from NSPCC Scotland said: “McGregor is an extremely dangerous offender who preyed on young children before sharing footage online. It is right that he has been handed a long prison term to protect others from his offending.
“Attacks on children by someone in a position of trust are every parent’s worst nightmare. The impact of McGregor’s vile actions on the children involved cannot be underestimated.
"These are real children and behind every single one of these pictures is a vulnerable young victim. Abuse can ruin childhoods and affect individuals into adulthood so it’s vital his victims are now given the help and support they need to recover from what has happened to them.”
Any adult concerned about the welfare of a child or young person can call the NSPCC helpline for free, 24/7, on 0808 800 5000. Children can call Childline at any time on 0800 1111.
McGregor was told he would be on the sex offenders' register indefinitely.