A tense and closely watched legal battle unfolded at Southwark Crown Court in London on Monday as former Nigerian Petroleum Minister, Diezani Alison-Madueke, was subjected to intense cross-examination in a corruption trial that continues to draw international attention.
The former minister, who once controlled Nigeria’s oil and gas sector, faced sustained questioning from lead prosecutor Alexandra Healy KC, who accused her of deliberately misleading the court and minimising the extent of alleged corruption during her tenure.
Standing close to the witness box, Healy KC challenged Alison-Madueke’s credibility, telling her she was “lying to this jury” as she attempted to distance herself from luxury expenditures and alleged illicit financial transactions linked to her office.
Prosecutors described the case as involving a coordinated system of influence and financial gain within Nigeria’s oil sector, alleging that the former minister played a central role in what they termed a structured bribery network rather than acting as a passive official.
During her testimony, Alison-Madueke denied knowledge of several luxury purchases allegedly made on her behalf, insisting she was not aware of the extent of the spending attributed to her associates. However, prosecutors countered her claims with documentary evidence presented in court.
Healy KC rejected her explanations, stating: “You are not telling the truth. You knew exactly who was paying, and you knew exactly why.”
The defence also revisited claims by the former minister that she had been subjected to blackmail by prominent oil industry figures, including businessman Kola Aluko. She told the court she was pressured and threatened during her time in office.
However, the prosecution dismissed this narrative, arguing that evidence instead showed a highly influential figure who maintained strong control over key oil sector decisions and maintained close ties with the same individuals she accused of coercion.
A key moment in the proceedings came when the court was presented with a transcript allegedly retrieved from her phone. The 2014 communication reportedly contained a warning to associates: “I will be happy to escort all of you to jail along with myself… If you don’t do what I say, we all go down together.”
Prosecutors said the message contradicted her claims of victimhood, portraying her instead as a decisive actor managing pressure within a powerful network of political and business interests.
The hearing also revisited allegations surrounding luxury purchases, including what has been referred to in court discussions as the “Harrods issue.” Alison-Madueke told the court she had no knowledge of several items reportedly acquired in her name.
But witnesses from Harrods testified that she was a frequent customer who used personal shopping services and had specific preferences for high-end goods, directly contradicting her account.
Further scrutiny was directed at her claim that she reimbursed funds allegedly spent on her lifestyle. Prosecutors dismissed this explanation as unsupported by evidence, describing it as inconsistent with financial records presented before the court.
The Economic and Financial Crimes Commission (EFCC) was also referenced during proceedings, particularly regarding her claim that crucial documents were lost during a raid on her properties in Nigeria. Prosecutors argued there was no credible proof to support such a claim.
Additional evidence presented in court included emails and communications suggesting that some oil industry actors referred to themselves as her “loyal soldiers,” which prosecutors said demonstrated the level of influence she wielded over contract allocations during her tenure.
According to the prosecution, the overall evidence indicates that access, influence, and oil-related contracts were allegedly exchanged for luxury benefits, including foreign properties, designer goods, and high-end services.
Healy KC told the court that Alison-Madueke was not merely a minister overseeing the petroleum sector, but a central figure within a wider system where public office allegedly intersected with private enrichment.