"As a former international banker, I informed both the British and South African governments as early as October 1999 that the Barclays bank loan agreements for the [British defence company] BAE arms deal contracts would be fraudulent," the author and activist said in a statement.
"I also repeatedly pleaded with the former minister of finance Trevor Manuel not to sign those agreements."
He said the investigation should consider the implications of foreign control over South Africa's banking system, including what pressure was applied to Manuel to approve the "ill-considered" takeover of Absa.
"The reality is that Absa, to the detriment of the South African public, has been milked by Barclays.
"Although Absa's assets amount to only 4% of the total, Absa is reported to contribute 20% to total Barclays' group revenue," he said.
"Surveys repeatedly find Absa to be the most expensive of South African banks. The former governor of the South African Reserve Bank noted as early as 2007 that he failed to see any benefits of Barclays' management at Absa."
Absa declined to comment on Crawford-Browne's claims, and presidential spokesperson Mac Maharaj could not be reached for comment.
Crawford-Browne said he had made a submission to the Seriti Commission – an arms deal probe – to request an investigation of perjury charges against Manuel and Maria Ramos in connection with the arms deal.
"Ms Ramos was then director general of treasury, and under oath, affirmed that the 'agreements … are self-standing loan agreements with binding force and not dependent on any other agreement entered into by government'."
"This lie was exposed by the Barclays bank loan agreements," he alleged.
He said he had previously submitted affidavits that detailed how BAE paid bribes of £115-million (more than R1.5-billion) to secure its arms deal contracts, to whom the bribes were paid and to which bank accounts the bribes were credited.
The documents also revealed the complicity in money laundering of the British government and both international and South African banks.
'Conflicts of interest'
He claimed that when a court awarded him with the discovery of the international offers negotiating team and financial working group papers for the arms deal, Manuel and Ramos refused to comply.
"The court had previously rejected their arguments that it 'was not in the national interest to reveal how the government conducts its international financial arrangements'," he said.
"This is pertinent given enthusiastic approval by the minister in 2005 when Barclays Bank took over Absa with a 55.5% shareholding. What threats did Barclays Bank make?" he asked.
He said Human Settlements Minister Tokyo Sexwale was a major shareholder in Absa and a former director.
Ramos was appointed chief executive of Absa in 2009.
"Clear conflicts of interest are evident," Crawford-Brown said. – Sapa