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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 Lockerbie Fatal Accident Inquiry was a judicial investigation that formally established the cause of death for the 270 victims and examined the security failures that allowed a Semtex bomb to be loaded onto the aircraft.

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 Hungerford inquiry was a swift ministerial review that identified lethal loopholes in the Firearms Act 1968, leading directly to the banning of semi-automatic centre-fire rifles and a significant tightening of shotgun licensing.

The Bichard Inquiry, launched in 2003 following the Soham murders, exposed failures in police vetting and intelligence-sharing, leading to crucial reforms in child protection. Its 2004 report resulted in the creation of the Disclosure and Barring Service (DBS) to ensure stricter background checks for individuals working with vulnerable groups.

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.

On March 22, 2017, Khalid Masood drove a car into pedestrians on Westminster Bridge, injuring over 50 people and killing four before crashing into the perimeter fence of the Palace of Westminster. He then ran into New Palace Yard, where he fatally stabbed an unarmed police officer before being shot dead by armed officers. The attack was treated as Islamist-related terrorism, though UK authorities found no direct links between Masood and any terrorist organization.

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 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 Dunblane Inquiry was a rapid judicial investigation into a school massacre that identified systemic failures in firearms licensing and vetting, leading directly to a near-total ban on handguns in the United Kingdom.

The inquiry concluded that while there was no evidence of a "conspiracy" by state agencies to murder Rosemary Nelson, the RUC and security services failed to protect her and, through their own hostile actions, helped "legitimise" her as a target for loyalist paramilitaries.

The Litvinenko Inquiry was a public investigation chaired by Sir Robert Owen, examining the circumstances surrounding the death of Alexander Litvinenko, who was poisoned with polonium-210, and concluded that the Russian state was likely involved

The Hutton Inquiry investigated the circumstances surrounding the death of Dr. David Kelly, who was identified as the source of a BBC report claiming the UK government had exaggerated intelligence about Iraq's weapons of mass destruction