Your browser is out of date

This website has been built for modern browsers, yours is many years out of date and as a result, your experience of this website will be poor.

Please upgrade your browser and pop back.


07888 733372

GH Specialist Police Procedural Consultancy Services offers expert procedural advice concerning all aspects of Crime Fiction and True Crime, specialising in Homicide and major crime. Founder and Owner, Gary Holmes, is a highly-experienced former Scotland Yard Homicide Senior Investigating Officer and a professional Police Procedure Consultant who now offers his vast experience and expertise to writers, producers, actors, directors and film-makers of both the Crime Fiction genre and True Crime projects.

Image of Gary

About Gary

Gary is a highly-decorated former senior police officer who enjoyed an illustrious career in London’s Metropolitan Police. In a career which spanned over thirty years Gary rose to the rank of Detective Chief Inspector and the pinnacle of his career was leading one of New Scotland Yard’s Homicide and Major Crime Team’s.

Gary was a nationally-accredited Senior Investigating Officer (SIO), and in the years he spent in this role he personally led over 40 homicide investigations. These investigations included cold case murders, double homicides, gang-related killings, child murders, domestic murders, murder / suicide cases and ‘stranger’ attacks (where random attacks were carried out with no prior link or association between the suspect and the victim).

Gary has worked with law enforcement agencies around the globe on an array of major investigations. He has worked closely with police forces and prosecutors in the United States, Australia, Saint Lucia and across Europe.

Gary has featured as a contributor on international true crime documentary, “Meet, Marry, Murder”, which has been broadcast in the United States and the United Kingdom and true crime documentary, “Killer Britain” hosted by Dermot Murnaghan, one of the UK’s leading journalists and broadcasters. In these documentaries Gary has provided his expert insight and analysis into various aspects of homicide investigation.

Video Credit to Firstlook TV

Services - What we do


True Crime

Are you a producer, writer, film director or documentary maker seeking to maximise the authenticity and calibre of your project? Then we can offer a tailor-made service to meet all of your needs and to make your project the very best it can be.

Gary offers extensive and in-depth advice to writers, television/film production companies in relation to the making of True Crime documentaries and True Crime books/literary articles. This entails advice and consultation both behind the scenes and in front of the camera, providing both invaluable insight and expert analysis from the perspective of a highly experienced and accomplished Homicide Senior Investigating Officer.


Fictional Crime

Are you an author, director or actor preparing for a challenging police role, script or storyline? Are you seeking to truly understand how it really is to be that person actually leading a high-profile homicide or major investigation? Want to truly understand the pressures and priorities you would face when working tirelessly in a fast-paced environment to identify a ruthless killer and how this would manifest in your characters and scenes? Want to know how you can present your characters and scenes in the most authentic and compelling manner to maximise the entertainment of audiences and readers?

Gary offers specialist procedural and technical advice to the makers of fictional crime dramas, screenplays and crime fiction authors that will answer all of your questions and fulfil your every need.

The unique personal insight Gary offers drawing on his many years of experience will equip you with everything you need to enable you to portray your police characters and storylines with all the gritty traits of the real thing.

Gary’s services range from the review of single chapters to entire manuscript, screenplay and project reviews. At the conclusion you will be provided with a constructive report highlighting suggested areas where the authenticity of your project may be enhanced to reflect the ‘real thing’, as close as possible, whilst still maximising the interest and entertainment of your audience and readers.

Gary offers consultation services either via phone, online (virtual) or in person which start with a one-hour session but can be extended dependent upon the nature and complexity of your project. A service can also be supplied in support of ongoing projects which are likely to be longer term in nature. This would afford regular consultation access to Gary over an agreed period so that he can optimise expert support for your project throughout.

‘On-Set’ advice is a service Gary offers to truly authenticate how your police scenes can be accurately depicted. This includes expert advice in relation to ‘props’, layouts and optics to assist in replicating how the ‘real thing’ would actually look – for example, what you would really see at a major crime scene and what policing activity would be taking place in and around such a scene, how a Major Investigation Team would practically operate within a police environment and how this would actually look, etc.

One-to-one actor tuition sessions and actors’ workshops is a service Gary offers. These are aimed at providing actors with a true and intimate sense of how it really is to walk in the shoes of the person leading every facet of a complex homicide investigation – as Gary has done many times. This offers the actor a ‘no holds barred’ opportunity to experience every thought, vulnerability and emotion they would go through as if they were actually leading a real-life homicide investigation.

In relation to the fictional crime genre Gary can add a real authenticity to any project, making it highly entertaining to the many millions around the world who follow this intriguing genre. This is achieved by working closely with writers, producers and actors to draw upon the immense knowledge and experience gained through many years of investigating real-life major crime to transform your project into a fascinating and highly credible production.

Summary of services


Gary Holmes was a top notch police officer - his standards were on display when he worked with us on a TV documentary. Accurate and balanced, his portrayal of the story also offered suspense and drama as we heard of the twists and turns of the case we were following.

In TV there is a practical side which can never be under-estimated. We need to work with people who know we have time constraints, editorial boundaries and ofcom regulatory factors to consider and to do this whilst making a shot or interview set up look fantastic.

Gary took all of those challenges on board and made things happen.
A pleasure to work with. - Will Hanrahan, Creative Director and Co-Founder, FirstLook TV.

Gary's True Crime Cases

Below is just a small sample of a summary of recent Homicide investigations that were conducted by Gary. You can read how as a Senior Investigating Officer in charge of the Homicide Team, he applied his tenacious and highly specialised investigation skills to bring real-life murderers to justice. Please note that all of these cases resulted in convictions following trial in open court and the facts were widely reported by various media news agencies. Therefore, this information is already in the public domain and various news links are listed above each of the cases which may be accessed to view just a sample of the media coverage each case attracted.


Read More


Read More


Read More


Read More

Other Notable Homicide Cases

Throughout his career as a senior detective and in addition to his extensive work in homicide, Gary has acquired an enormous wealth of policing experience and has led numerous investigation teams specialising in the following areas:

Covert Operations

Complex undercover and covert investigations aimed at infiltrating Organised Crime Groups involved in the large-scale supply of drugs and firearms.

Kidnap, Blackmail and Extortion

Fast-time investigations to safely recover hostages in ‘threat to life’ situations and to arrest/prosecute the kidnappers. In this role, Gary also trained and qualified as a Tactical Firearms Commander to lead specialist firearms teams to safely rescue hostages and arrest the perpetrators.

Rape and Serious Sexual Offences

Rape investigations, including complex serial rape enquiries and investigations concerning other forms of serious sexual offences.


Covert operations proactively targeting some of the most prolific London gangs engaged in murder, drug-trafficking and firearms.

Child Abuse

Investigations to target international paedophile networks seeking to groom and abuse vulnerable children.


Proactively targeting corrupt members of law enforcement and Organised Crime Groups which were seeking to corrupt police officers.

Contact Us

07888 733372
Social Media