Allan Grimson

Introduction

Allan Grimson is a 66-year-old former Royal Navy petty officer who was serving a life sentence for the murders of two young sailors when a jury at Winchester Crown Court convicted him of a series of non-recent sexual offences against a teenage boy and young Navy recruits, and on November 6, 2026 he had a further 22 years added to his sentence. Grimson, who served as an instructor at the Royal Navy Firefighting School at Horsea Island, was found guilty on July 27, 2026 of twelve counts of indecent assault and one count of taking indecent photographs of a child, covering offences committed between 1994 and 1999. His victims included a 14-year-old boy and young servicemen at the start of their naval careers, and the prosecutions followed a fresh review prompted by a referral to the Child Sexual Abuse Review Panel after earlier decisions to take no further action.

Background Information

Grimson is already serving a life sentence for the murders of Royal Navy ratings Nicholas Wright and Sion Jenkins, whom he killed in 1997 and 1998 after meeting them in Portsmouth; both men were sexually assaulted before they were murdered. He was arrested in December 1999 during the investigation into Wright’s disappearance, and searches of his Portsmouth flat and family addresses uncovered photographs and evidence linking him to a number of young males, including indecent photographs of a child and images involving another complainant. During police interviews Grimson identified individuals shown in the photographs and admitted sexual activity with some of the victims. The convictions decades later arose after the Child Sexual Abuse Review Panel, a joint initiative of the National Police Chiefs’ Council and the Crown Prosecution Service that reviews cases where police or the CPS previously decided to take no further action, referred the case for fresh review.

The Controversy or Incident That Led to Their Cancellation

Convicted and sentenced. Grimson was convicted of 7 counts of indecent assault on a male, 4 counts of indecent assault on a boy under 16 and 1 count of taking indecent photographs of a child in July 2026, and on November 6, 2026 received a further 22 years’ imprisonment.

The prosecution case centred on four victims. Grimson befriended young males he met through the Royal Navy and personal connections before sexually abusing them, with several offences taking place at his Portsmouth flat. Jurors heard evidence from victims who described being abused while asleep, intoxicated or too frightened to challenge Grimson’s behaviour, and one victim told police he had only felt able to come forward after Grimson had been imprisoned because he finally felt safe. After reviewing the evidence, the CPS authorised charges; James Foster, Specialist Prosecutor, said the conviction demonstrated “that the passage of time is not a barrier to delivering justice for victims of non-recent sexual abuse,” and that following the panel referral the service had carried out “a fresh review of two of the original decisions in this case and concluded that criminal charges should be brought.” The new 22-year term will not permit parole consideration until Grimson has served at least 13 years of it.

Public Reaction and Consequences

The Crown Prosecution Service framed the outcome around the courage of the victims who gave evidence against a man already imprisoned for two murders, with Foster paying tribute to “the courage and determination they have shown throughout this process” and expressing the hope that the sentence “encourages other victims and survivors to come forward knowing they will be listened to and taken seriously.” The case’s trajectory, from 1990s decisions to take no further action, through the panel referral mechanism established in 2013, to a jury conviction in 2026, was presented by the CPS as an example of why non-recent allegations are pursued wherever there is sufficient evidence. The sentence adds substantially to a life term already in place for the murders of Wright and Jenkins.

Current Status

Grimson, 66, remains in prison serving his existing life sentence for the two 1990s murders, now with an additional 22-year term for the sexual offences of which he was convicted in July 2026 and sentenced in November 2026. He will not be eligible for parole on the new term until he has served at least 13 years of it. The sexual-offence convictions formally extend the criminal record of a man whose Navy instructor role at the Horsea Island firefighting school gave him access to the young recruits he was found to have abused, and the CPS has stated that the panel-referral route that produced the charges remains open to other victims of historic decisions.

Impact on Their Career/Life

For Grimson, already decades into a life sentence, the 2026 convictions convert what had been a double-murder sentence into a combined term that takes account of the pattern of sexual abuse underlying his offending, with the court recording his use of a Navy instructor position to target boys and young men over years. His Navy career ended with the 1999 arrest, and the fresh convictions attach to his record the findings of twelve indecent assaults and the taking of indecent photographs of a child. The victims, some of whom spoke of decades of silence, received the court’s acknowledgment through the sentence and through the prosecutor’s tribute, in a case the CPS presented as proof that non-recent sexual abuse can still be prosecuted decades later.

Sources

• Crown Prosecution Service, “UPDATED WITH SENTENCE: Double murderer Allan Grimson sentenced for non-recent sexual offences,” November 2026. source