Saatchi: Thatcher's 'eyes blazed'
11 April 2013 Last updated at 17:09 BST
The former Conservative Party Chairman, Lord Saatchi, was an advertising guru who in 1979 helped define, and sell, what Margaret Thatcher's Conservatives stood for.
He is currently chair of the Centre for Policy Studies, a think-tank founded by the former British prime minister in the 1970s. He remained close to Lady Thatcher until her death on Monday.
Lord Saatchi told HARDtalk's Stephen Sackur that Lady Thatcher - a pioneer of free market economics - would have found the recent banking crisis and the market dominance of a handful of financial companies "completely unacceptable".
You can watch the full interview on BBC World News on Thursday 11 April at 20:30 GMT and on the BBC News Channel on Friday 12 April at 00:30 BST.