In 2026, the Offender Database recorded that Mark Ollerenshaw, 52, is serving a decade-long prison sentence for the sexual assault of a girl under the age of 13. On appearing at Derby Crown Court in 2019, the defendant, of Cowsley Road, Chaddesden, Derbyshire, was jailed after pleading guilty to charges including assault by penetration. It was reported that Ollerenshaw targeted the youngster on multiple occasions, touching her both over and under her clothing and instructing her not to tell anyone about his actions.
The investigation established the predatory and harmful nature of Ollerenshaw’s conduct. Derbyshire Constabulary reported that the abuse only came to light when the brave victim disclosed the incidents to her mother, who immediately contacted the police. The prosecution reported that the assault has left the young girl terrified in her own home, fearful of walking to school alone, and struggling with persistent sleep deprivation.
Judicial Findings and Investigative Detail
The court reported that the impact on the survivor and her family has been devastating. Derby Crown Court heard victim impact statements detailing how the girl no longer feels comfortable playing with her friends and how the incident has “broken the heart” of her mother. The investigation established that while a psychological report indicated Ollerenshaw had an extremely low range of mental ability, these difficulties did not excuse the “dreadful” nature of his crimes.
Judge Shaun Smith QC described the matter as a very serious case involving repetitive sexual contact. For his actions in Chaddesden, Ollerenshaw was handed a 10-year custodial sentence. The judge noted that the severity of the trauma inflicted on the child necessitated a long-term prison term and a permanent restraining order to ensure he can never attempt to contact the victim or her family again.
Status and Statutory Requirements
For the crimes reported in England, the status of Mark Ollerenshaw is as follows:
- Custodial Sentence: 10 years in prison (Sentenced 2019).
- Sex Offenders Register: Notification requirements are active for life.
- Restraining Order: Indefinite order banning all contact with the victim.
- Judicial Oversight: Sentenced at Derby Crown Court following a Derbyshire Constabulary investigation.
- Criminal Record: Assault of a child under 13 by penetration; Sexual assault on a girl under 13.
- Origin: Cowsley Road, Chaddesden, Derby, Derbyshire.
Monitoring and Public Protection
Ollerenshaw is managed under Multi-Agency Public Protection Arrangements (MAPPA) at a high level of scrutiny. Due to the nature of his conduct in Derby, which involved the grooming and physical assault of a young child, his management is a priority for the Public Protection Unit. Authorities state that his life-long registration and indefinite restraining order are critical tools to ensure he is strictly monitored by police and probation services upon any eventual release to prevent him from targeting children in the future.
As a member of the Sex Offenders Register for life, Ollerenshaw must comply with all notification requirements regarding his identity and residence. Authorities state that his history of predatory aggression in Chaddesden necessitates permanent vigilance by local law enforcement. Any future attempt to contact the survivor, enter areas where children congregate, or fail to disclose his location to the authorities will result in immediate arrest and an instant return to the prison system.
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