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 Richard Commission was an independent investigation into whether the newly formed National Assembly for Wales had sufficient legal powers and a fair enough voting system to effectively govern the country.

The Bledisloe Commission investigated the feasibility of merging Southern Rhodesia, Northern Rhodesia, and Nyasaland, ultimately advising against immediate full amalgamation due to the "native question" and the starkly different racial policies between the territories.

The Peel Commission was a landmark British inquiry that declared the Mandate for Palestine unworkable due to irreconcilable national aspirations and proposed the first formal plan to partition the land into separate Arab and Jewish states.

A proposal by the Central Electricity Generating Board to construct a pressurized water reactor nuclear power station at Sizewell, Suffolk.

Inquiry into the unauthorised disclosure of information relating to the Budget

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 Chilcot Report concluded that the UK chose to join the invasion of Iraq before peaceful options for disarmament had been exhausted, based on "flawed intelligence" and "wholly inadequate" planning for the post-conflict period.

The Edinburgh Tram Inquiry investigated the delays, cost overruns, and reduced scope of the Edinburgh Trams project, ultimately providing 24 recommendations to prevent similar failures in future infrastructure projects

The Holyrood Inquiry was a definitive investigation into how a national landmark became a symbol of public-sector mismanagement, concluding that the project was doomed to exceed its budget from the moment a "fast-track" construction method was chosen for a complex, evolving design

The Independent Public Inquiry into the Non-Domestic Renewable Heat Incentive (RHI) Scheme, chaired by Sir Patrick Coghlin, investigated the serious flaws and administrative failings that led to the scheme's significant financial overspend and misuse. The inquiry, which lasted approximately 24 months, resulted in 44 recommendations aimed at preventing similar issues in future government schemes.

The Legg Inquiry investigated whether British officials or ministers secretly approved a shipment of arms by Sandline International to Sierra Leone in breach of a UN embargo, ultimately finding that while some officials were aware of the plans, there was no ministerial conspiracy.

To investigate the role of ministers and Parliament in the approval of arms exports to Iraq during the 1980s

The Hammond Inquiry into Ministerial Conduct Relating to the Hinduja Affair, chaired by Sir Anthony Hammond, was a brief investigation lasting 45 days in 2001, which produced 9 recommendations addressing the conduct of ministers involved in the affair.

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