The Bingham Inquiry (1977–1978) stands as one of the most significant exposés of corporate and political double-dealing in British history. Formally titled the Report on the Supply of Petroleum and Petroleum Products to Rhodesia, it was led by Thomas Bingham QC. Its purpose was to investigate how the illegal white-minority regime of Ian Smith in Rhodesia managed to obtain oil for over a decade despite strict United Nations sanctions following its Unilateral Declaration of Independence (UDI) in 1965.

The inquiry’s findings, published in September 1978, were explosive. Bingham revealed that British oil giants Shell and BP had systematically bypassed sanctions through a "swap arrangement." To maintain a veneer of legality, these companies provided oil to the French firm Total in South Africa, which then supplied Rhodesia. This allowed British companies to claim they were not directly fueling the regime while their South African subsidiaries ensured the oil flow remained uninterrupted.

Even more damaging was the revelation regarding government complicity. Bingham found that high-ranking British officials and ministers had been aware of these "swap" arrangements as early as 1968. While the British government publicly championed the "Beira Patrol"—a Royal Navy blockade intended to stop oil tankers—they privately sanctioned the land-based routes through South Africa and Mozambique that made the blockade a hollow, theatrical gesture.

The report’s impact was profound but ethically complex. It shattered Britain’s moral standing among African nations, who argued that if the oil lifeline had been truly severed, the Smith regime would have collapsed in months rather than lasting 14 years. However, despite the detailed evidence of "sanctions-busting," the inquiry resulted in no criminal prosecutions. The Director of Public Prosecutions ultimately decided that the "tacit approval" given by the government made a successful legal case nearly impossible.

Bingham’s work is now studied as a landmark in the history of the Rule of Law. By acting as a "fact-finder" rather than a judge, Bingham produced a 500-page narrative so scrupulously documented that it left the government with no room to hide. It remains a definitive case study in how corporate interests and "realpolitik" can undermine international law, and it solidified Thomas Bingham's reputation as one of the most intellectually honest jurists of the 20th century.