The IICSA was a landmark statutory investigation that exposed decades of systemic, institutional failure to protect children from sexual abuse in England and Wales, describing the scale of the problem as "endemic".

The review concluded that vulnerable children were left exposed to sexual exploitation due to "serious failings" by Oldham Council and Greater Manchester Police (GMP), though it found no evidence of a deliberate institutional cover-up.

The Fairfield Progress Review is an independent investigation launched to verify whether the Metropolitan Police Service has effectively addressed the institutional racism, misogyny, and homophobia identified by Baroness Casey, or if more radical structural changes are now required.

The Casey Review (2023) provided a definitive judgment that the Metropolitan Police is institutionally discriminatory and fundamentally broken, triggering a massive national clear-out of unfit officers and a return to chief-led disciplinary powers.

The Chapman Review (2014) was a rapid independent review that moved police discipline from a private internal process to a transparent public one, introducing Legally Qualified Chairs and banning officers from resigning to escape investigation.

The Taylor Review of Police Disciplinary Arrangements (2005) recommended shifting the police misconduct system away from a slow, overly legalistic "blame and punishment" model toward a more efficient, manager-led approach focused on professional development and learning.

The Morris Inquiry (2004) was a landmark investigation that exposed a culture of "institutional racism" and unfairness within the Metropolitan Police’s disciplinary systems, recommending a shift from a punitive, quasi-criminal approach to a fairer, modern human resources model.

The John Barrett Inquiry was a 12-month independent investigation into the 2004 killing of Denis Finnegan, which concluded that the death was an avoidable tragedy caused by "seriously flawed" clinical decisions and a failure to prioritize public safety over patient liberty.

The Butler Inquiry was an independent review into why the Crown Prosecution Service consistently failed to prosecute police officers following deaths in custody, despite inquest juries frequently returning verdicts of "unlawful killing."

The Chhokar inquiry consisted of two non-statutory reviews that investigated the systemic failures and institutional racism following the 1998 murder of Surjit Singh Chhokar in Scotland. These reports heavily criticized the police and prosecution for mishandling the case and failing to support the family, leading to over 100 recommendations for structural reform. Ultimately, the inquiry’s legacy triggered the 2011 Double Jeopardy Act, which enabled a successful retrial and the final conviction of Ronnie Coulter in 2016.

The inquiry is a national, statutory investigation into the systemic failure of state institutions to protect children from group-based sexual exploitation, specifically examining the role of ethnicity, religion, and culture in the "blind eye" turned by authorities.

A full statutory investigation into the violent 1984 clashes between police and striking miners at the Orgreave coking plant and the subsequent allegations of police perjury and evidence fabrication.

A police inquiry and inquest investigated the deaths of Princess Diana and Dodi Al Fayed. They faced a storm of theories suggesting conspiracies and collusion. While the inquest found more mundane contributing factors to the death, the detailed rebuttals by the police report have never satisfied some.

The inquests concluded that the victims were unlawfully killed following a catalogue of "systemic failures" by the police and probation services, which missed numerous opportunities to identify that the perpetrator was planning an attack.

The inquiry investigated the systemic failures in police intelligence and school vetting that allowed Ian Huntley to be employed as a caretaker despite a history of sexual offence allegations, leading to the creation of the modern Disclosure and Barring Service (DBS).

On 7 July 2005, four suicide bombers detonated explosives on three London Underground trains and a double-decker bus, killing 52 people and injuring nearly 800 in the worst terrorist attack in British history since Lockerbie 1988. The bombers, linked to Islamist extremism, carried out coordinated strikes during morning rush hour, causing chaos across London and prompting an extensive investigation into security failures and counterterrorism strategies. The attacks led to major reforms in UK security policy, including enhanced intelligence-sharing, increased surveillance, and stricter anti-terrorism laws.

The panel concluded that the 2011 riots were fuelled by a "lack of opportunities" and a "significant group of people who felt they had no stake in society," rather than being purely motivated by political protest or organized crime.

The Daniel Morgan Independent Panel was an eight-year investigation into the unsolved 1987 murder of Daniel Morgan, exposing institutional corruption within the Metropolitan Police and making 24 recommendations to improve accountability, transparency, and support for victims' families.

The 2017 Angiolini Review was an independent, non-statutory investigation into systemic failures surrounding deaths in police custody, highlighting that restraint should be treated as a medical emergency rather than just a use-of-force issue.

To examine the circumstances surrounding Axel Rudakubana's attack in Southport in 2024 and the events leading up to it

Investigate how Wayne Couzens, an off-duty Metropolitan police officer, was able to abduct, rape and murder Sarah Everard.

Allegations that John Waters was assaulted by police officers on 7 December 1957, at Thurso and the action taken by the Caithness Police in connection therewith

The inquiry aimed to investigate the legality of the arrest, the treatment of Major Sheppard while in custody, and any potential misconduct by the police officers involved.

The Statutory Inquiry into the Death of Jalal Uddin investigates the circumstances of his 2016 murder, focusing on systemic issues, counter-terrorism measures, and police actions, aiming to provide recommendations to prevent similar tragedies.

The Dawn Sturgess Inquiry is an independent investigation into the circumstances surrounding the 2018 Novichok poisoning incident in Salisbury, focusing on the death of Dawn Sturgess.

The inquiry investigated the handling of Stephen Lawrence's murder case and concluded that the Metropolitan Police Service was institutionally racist, leading to significant reforms in policing and criminal justice in the UK.

The UCPI is an exhaustive investigation into 50 years of clandestine policing that has exposed institutional "malaise," the routine deception of women into long-term sexual relationships, and the infiltration of over 1,000 peaceful political groups.

The Robert Hamill Inquiry investigated the death of Robert Hamill, examining whether any wrongful act or omission by or within the Royal Ulster Constabulary facilitated his death or obstructed the investigation, and made recommendations accordingly.

The Azelle Rodney Inquiry (2013) was a judicial investigation into the 2005 fatal shooting of a 24-year-old man by the Metropolitan Police. It made legal history as the first public inquiry in the UK established specifically to replace a coroner's inquest because "secret evidence" could not be heard in a normal court.

The Grainger Inquiry concluded that Anthony Grainger's death was caused by a "calamitous combination of errors and blunders" by Greater Manchester Police, whose incompetent planning and flawed intelligence led to an unarmed man being shot while sitting in his car.

The Detainee Inquiry was a high-level investigation into British complicity in the post-9/11 rendition and torture programme that was curtailed by ongoing police investigations, resulting in a "preparatory report" that highlighted dozens of serious, unresolved allegations.

The Fingerprint Inquiry was a public inquiry set up by the Scottish Government to investigate the steps taken to identify and verify fingerprints in the case of Shirley McKie, leading to significant recommendations for forensic practices