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Double murderer Allan Grimson given extra 22 years for historical sexual assaults

Judge Paul Dugdale said Grimson remains a danger to the public and will not be eligible for parole until he has served 13 years.

  • On Friday, former Royal Navy petty officer Allan Grimson received a 22-year sentence for 13 sex offences against young naval recruits and a 14-year-old boy committed between February 1994 and November 1999.
  • Grimson, formerly an instructor at the Royal Navy Firefighting School on Horsea Island, Portsmouth, exploited his authority over young naval recruits to abuse victims in the same flat where he later murdered two sailors in the 1990s.
  • While Grimson claimed the trial was a 'tactic' to block his parole, victims described decades of trauma, with one stating "The loss of trust, the damage to my relationships, the feelings of shame, and the unanswered questions have stayed with me for over 30 years."
  • Judge Paul Dugdale declared Grimson "dangerous" and a threat to the public, ruling he remains ineligible for parole for 13 years—meaning he will stay in custody until three months before his 80th birthday.
  • Detective Inspector Martin Longyear of Hampshire Constabulary acknowledged the victims' bravery, stating the conviction "will help them find some form of closure." Police confirmed closure of their investigation in 2025 into the 1986 disappearance of radio operator Simon Parkes.
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The News broke the news in Portsmouth, United Kingdom on Friday, November 6, 2026.
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