The court was also told that Alison-Madueke’s phone was seized in 2015 during police searches, revealing recorded conversations in which she is said to have confronted Aluko over suggestions he had spoken about the gifts given to her at a time when their relationship was breaking down.

In a conversation in May 2014, Alison-Madueke told Aluko she was really annoyed, given that she and others had “stuck our necks out” when negotiating oil mining leases.

“I will be happy to escort all of you to jail along with myself… you’ll be shocked what I will do”, she is alleged to have said, adding: “I will come out and tell the Nigerian people this is what happened.

“Oh yes, I will blame myself… I will come out openly and say it so that they can judge me openly. And then all of us go and sit on the gate let us see who survived.”

In another instance, Igho Sanomi, an oil executive whose company was awarded Nigerian state contracts between 2011 and 2015, carried out shopping errands in London for Alison-Madueke, the court heard.

Text messages recovered from her phone showed Sanomi pledging his “loyalty and commitment”, and agreeing to collect Louis Vuitton hat boxes, replying: “Yes Your Excellency consider this done”.

By 2014 he expressed concern their relationship was deteriorating and so he allegedly sent Alison-Madueke an email calling himself her “true soldier”.

Three weeks later, Sanomi’s company was part of a consortium that was awarded a new oil mining lease by her, the court heard.

Alison-Madueke’s brother, former bishop Doye Agama, 69, is also charged with conspiracy to commit bribery, with prosecutors claiming he was paid £1.2m in bribes by businessman Peters.

The payments were intended to “induce Alison-Madueke to perform her duties as the Nigerian minister of petroleum resources improperly,” lawyers told the court.

Also on trial is industry executive Olatimbo Ayinde, 54, who is charged with one count of bribery relating to Alison-Madueke and a separate count of bribery of a foreign public official.

Both Agama and Ayinde deny the charges.

The trial continues.