An 83-year-old man has received a four-year prison sentence after accumulating what police believe is the largest collection of child sexual abuse material ever seized in Scotland. Alan MacPherson, from Stenhousemuir, possessed more than two million images across multiple electronic devices following a raid on his home in 2025.
Sheriff Mayram Labaki described the scale of the offending as "exceptional" during sentencing at Falkirk Sheriff Court. The sheer volume of material meant that forensic examiners were unable to examine and categorise a substantial portion of the collection, though more than 805,000 images were identified as depicting child sexual abuse, with much of it classified in the most serious category.
MacPherson will be subject to three years of supervision following his release and will remain on the sex offenders register for life. According to reporting on the case, the indictment covered downloading, possessing and distributing indecent material spanning more than 14 years, from 1 January 2012 to 20 January 2026.
How was he caught?
Police identified MacPherson's internet protocol address being used to distribute child abuse material online. In July 2025, he posted multiple images classified as the most serious category of child sexual exploitation during an online chat with an undercover police officer. Although he was using a messaging application designed to be anonymous, investigators were able to trace the messages back to his home address.
Prosecutor Rachel Wallace told the court that police have advised this is quite possibly the largest collection of child sexual abuse material ever encountered by Police Scotland. When arrested and interviewed, MacPherson admitted to searching online for years for indecent images of children "for his own personal gratification".
What was the scale of the collection?
Officers seized nine devices from MacPherson's home, including computers, phones, digital cameras, a USB stick and external drives. Child abuse material was discovered on every single device. Five of the devices underwent full forensic examination, though the extent of the collection proved overwhelming. Almost 1.4 million images remained ungraded on one device alone due to the sheer volume of material stored there.
The child victims depicted in the images were predominantly girls aged between nine and 15, though at least one victim was possibly as young as seven years old. Sheriff Labaki stated in court that
every image records the abuse or exploitation of a child. The possession and circulation of such material perpetuates that abuse.
What was the defendant's attitude to his crimes?
The sheriff expressed serious concern about MacPherson's lack of remorse and his views regarding his offending. Sheriff Labaki remarked:
Your views towards your offending and your victims are unconscionable. I refer specifically to the passages in the [social work] report where you state that not only were the children consenting, but they were willing participants. Your attitude is unremorseful.
The sheriff also noted that
the quantity [of images] was so great that a substantial proportion could not be examined and categorised by forensic examiners.According to court records, MacPherson was described by the judge as a first offender despite the severity and scale of his crimes.
What mitigating factors were presented?
Solicitor advocate Stephen Biggam, acting in MacPherson's defence, highlighted that his client would "steadily lose his eyesight" due to macular degeneration. He suggested to the court that this condition "will eliminate or significantly mitigate any risk going forward". Biggam also noted that MacPherson's wife had served divorce papers on him while he was in custody, and that his wife, son and the vast majority of people in his life had made clear they wanted nothing further to do with him.
What was MacPherson's background?
MacPherson previously held a voluntary role with the Royal Scottish Country Dance Society as honorary archivist. Following the court proceedings and revelations about his crimes, the society issued a statement expressing shock and dismay. A spokesperson said:
We are shocked and appalled by the offences committed by Alan MacPherson and the details which have emerged through these court proceedings. The society takes the safeguarding and wellbeing of everyone involved in its activities extremely seriously and has clear safeguarding policies and procedures in place.
The society added that anyone with concerns relating to MacPherson or his involvement in the organisation should contact them directly, and that
any concerns raised will be treated seriously and sensitively and, where appropriate, referred to the relevant authorities.
What happens next?
MacPherson was remanded in custody pending the preparation of pre-sentence reports, with a further hearing scheduled for 8 September 2026 for formal sentencing.
Key Facts:
- MacPherson accumulated more than two million images, with over 805,000 identified as depicting child sexual abuse in the most serious categories
- The collection was so extensive that forensic examiners could not examine and categorise a substantial portion of the material
- Police traced his distribution of abuse images through an anonymous messaging application after he posted material to an undercover officer in July 2025
- The victims were predominantly girls aged nine to 15, with at least one possibly as young as seven
- MacPherson will serve four years in prison, followed by three years of supervision, and will remain on the sex offenders register for life
