Free from the restrictions of political life, opportunities to make millions of pounds from directorships, book deals and speechmaking will open up in front of him. Tony Blair’s high-profile, lucrative and controversial post-Downing Street career as a Middle East peace envoy and international business broker – including a reported £2m a year role for JP Morgan – looms large over any speculation about what Cameron might do next. Taking corporate money after leaving office has become a well-trodden path. John Major, the prime minister until 1997, was chairman of the European private equity funds of the Carlyle Group until 2004. Gordon Brown’s first role in the private sector was on a global advisory board at the international investment firm Pimco; he gave his fees to charity.