She is the second high-profile Nigerian politician to face prosecution in Britain in recent years, following James Ibori, a former State Governor who was convicted of fraud and money-laundering in 2012 and received a 13-year jail sentence.
The charges against her, read out in court, all related to events alleged to have taken place in London during her time as a minister.
Prosecutor Andy Young said she was alleged to have accepted a wide range of advantages in cash and in kind from people who wanted to receive or continue to receive the award of oil contracts which he said were worth billions of dollars in total.
The advantages included a delivery of 100,000 pounds ($121,620) in cash, the payment of private school fees for her son, and the use and refurbishment of several luxurious properties in London and in the English countryside.
They also included the use of a Range Rover car, payment of bills for chauffeur-driven cars, furniture, and purchases from the upmarket London department store Harrods and from Vincenzo Caffarella, which sells Italian decorative arts and antiques.
Britain, Nigeria’s former colonial ruler, has long been a destination of choice for affluent members of the Nigerian political elite seeking to enjoy the benefits of their wealth.
London is a global money-laundering hub but it remains rare for public figures like Allison-Madueke to face prosecution for corruption-related offences.
Nigeria is Africa’s most populous nation and top oil producer but it suffers from systemic corruption in the political class which has hampered development and prevented its oil wealth from benefitting wider society.