In 2020, then 49-year-old William Trezise, of Roundham Road, Paignton, was jailed for 16 years for a predatory series of assaults that a judge described as a “staggering” catalogue of depravity. The investigation established that Trezise, who had run Roundham Garage for over 20 years, subjected a girl to an appalling campaign of rape and sexual abuse. The prosecution reported at Plymouth Crown Court that he even filmed his crimes and shared images of the girl with other predators, identifying a total abandonment of human decency.
The investigation established that Trezise’s series of behaviour was only uncovered when his wife discovered a memory card hidden in a sock inside his work bag. The prosecution reported that the device contained naked images of the girl captured via a secret camera Trezise had installed. This identifies a calculated series of assaults on the life-safety and privacy of the child, involving voyeurism and the distribution of indecent images, which Trezise carried out while maintaining a facade as a “proper decent human being” in the community.
DANGEROUS OFFENDER STATUS AND SENTENCING
The court reported that Trezise pleaded guilty to three counts of rape, seven of sexual assault, and four of sexual activity with a child, alongside voyeurism and digital exploitation charges. The investigation established that the victim could not recall the incidents, which Judge James Townsend noted would likely have a “devastating” effect once the extent of the betrayal was realised. The prosecution reported in 2020, that Trezise was judged a dangerous offender, identifying a priority assault by the judiciary to ensure he serves a minimum of 12 years before being considered for parole.
Judge-led proceedings at Plymouth Crown Court, conducted over Skype due to lockdown, concluded with Trezise’s 16-year incarceration in 2020. For his actions in Devon and the nature of the series of child abuse and digital voyeurism investigations reported, William Trezise has been removed from the community. The investigation established that his forensic profile as a predatory child abuser is now a matter of permanent record. He remains subject to a lifetime registration on the sex offenders register and an indefinite Sexual Harm Prevention Order.
STATUS AND CASE DETAILS (2020)
Based on judicial and Devon & Cornwall Police records as of 2020:
- Legal Status: CONVICTED (Rape x3; Sexual assault x7; Sexual activity with a child x4; Voyeurism; Distribution of indecent images; Child abuse).
- Custodial Status: JAILED (In 2020, serving a 16-year extended sentence).
- Offence Nature: Repeatedly raped and abused a girl; filmed the attacks; installed secret cameras for voyeurism; shared abuse imagery with other paedophiles; business owner in Paignton.
- Timeline of Case: Offences uncovered via hidden memory card; Sentenced over Skype April 2020.
- Location: Paignton, Devon; Plymouth Crown Court; Roundham Road.
- Forensic Profile: Then 49-year-old male; forensic history documents a “staggering” level of depravity hidden behind a 23-year career as a garage director; identified as a high-risk dangerous offender.
- Licence Period: Subject to licence and probation supervision for a total of 21 years.
- Judicial Oversight: Presided over by Judge James Townsend.
- Criminal Record: Convicted sex offender; Series predator; Child abuser; Jailed in 2020.
- Origin: Paignton.
MONITORING AND PUBLIC PROTECTION
In 2020, Trezise is managed as a maximum-risk predator under the statutory requirements of the Multi-Agency Public Protection Arrangements (MAPPA) in the South West. Due to the nature of the behaviour—specifically the series of persistence in utilizing hidden technology to facilitate and record the systematic abuse of a child—he is a priority for high-security incarceration. Authorities reported that the 2020 sentencing identifies Trezise as an individual who prioritised his own perverted gratification and digital exploitation over the principles of human decency and the life-safety of the girl.
As a registered sex offender for life, his details are permanently logged on the national police database to ensure he is never again permitted access to digital devices or proximity to children. Authorities stated that the behaviour of Trezise identifies a commitment to clandestine child abuse and the systematic violation of the victim’s innocence. Any future attempt to assault the terms of his 21-year licence or harm prevention order results in immediate police intervention to ensure the ongoing protection of the community from a man who used a “garage boss” mask to hide a predatory and persistent series of assaults.
QUESTION – Given that the offender “secretly filmed himself abusing a child” for years without detection until a family member found a memory card, do you believe the law should legally mandate that “All Convicted Voyeurs and Digital Predators” must undergo “Mandatory Monthly Forensic IT Audits” for life to prevent a series of assaults?
If you or anyone you know has been affected by the individuals highlighted on this website, please report them to the Police on 101 (999 in an emergency) or visit their online resources for further details on reporting a crime. You can also report to Crimestoppers if you wish to remain completely anonymous. There is help available on our support links page.

