Over the past few years Isabel dos Santos, the oldest daughter of Angolan President Jose Eduardo Dos Santos, has been buying more shares of publicly traded companies in Portugal, including shares in a bank and a cable TV company.

FORBES: Isabel Dos Santos, Daughter Of Angola's President, Is Africa's First Woman Billionaire

Vince Cable has called for Royal Bank of Scotland (RBS) to be split up, in a letter leaked to the BBC.

BBC: Cable calls for RBS to be split up

The business secretary, Vince Cable, said he hoped such a bank would "shake up the market" and help boost overall lending to firms.

BBC: Cable confirms government plans for a business bank

Mr Cable suggested in his speech that the future business bank could work with commercial banks such as the UK's Co-Op, and the British operation of Swedish lender Handelsbanken.

BBC: Cable confirms government plans for a business bank

Writing to Prime Minister David Cameron and Deputy Prime Minister Nick Clegg, Mr Cable said RBS should be turned into a new "British business bank".

BBC: Cable calls for RBS to be split up

"Fixed fundamentals are the key to our Reduce 2 rating, with accelerating mobile substitution, cable threat and unbundling all pressuring the division, " the Swiss investment bank said in a note.

FORBES: Deutsche Telekom Dives On Profit Warning

Well, the Treasury and the Business Department concede that Vince Cable has been over-ruled on the break-up of Royal Bank of Scotland, which he argued for in the letter I disclosed yesterday.

BBC: Will there be a British Business Bank?

Vince Cable, the Lib Dems' Treasury spokesman, becomes business secretary, in which role his anti-bank and anti-business rhetoric may give rise to some unhappiness.

ECONOMIST: British politics: Britain's accidental revolution | The