Alongside Gordon Brown in Westminster Abbey were former prime ministers Sir John Major and Baroness Thatcher.
Sir John Major introduced PFI in 1992 to allow private companies to finance, build and run public sector projects.
His wife, Baroness Hogg, sits as a crossbencher in the Lords having been made a life peer by former Tory Prime Minister Sir John Major.
Unlike Miss Greening, Mr McLoughlin - who was a transport minister under Lady Thatcher and Sir John Major - is said to have "no baggage" over Heathrow expansion.
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And although it is not binding on Mr Cameron, it has sparked comparisons with Sir John Major's Conservative government which was torn apart by splits on Europe in the 1990s.
Other guests include Kate Middleton's former headmaster, William's Eton housemaster and Sir John Major, the former British prime minister who was appointed guardian of Prince William after his mother's death.
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Former prime minister Sir John Major has said that parliamentary reform is badly needed to restore trust in politics and has heavily criticised the decision to go to war in Iraq.
So it will be with some passion that Sir John Major will welcome David Cameron's promise of an In-Out referendum, saying it is a chance to draw the poison of Europe from the well of British politics.
Thanks to the inquiry's impressive rota of high-profile witnesses including the current prime minister, David Cameron, and two former ones, Gordon Brown and Sir John Major it is possible to plot the country's senior politicians on a spectrum of enthusiasm for press regulation.
Her other successors in No 10 - Sir John Major, Tony Blair and Gordon Brown - praised her strength of character and political purpose, while Labour leader Ed Miliband said Lady Thatcher had been a "unique figure" who "reshaped the politics of a whole generation".
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Sir Alan also quit and under John Major, the new chancellor, the UK joined the ERM in October 1990.
EU's transport commissioner and the erstwhile opponent of one of Sir Michael's political heroes, John Major (he even lent the Conservative leader an aircraft for the recent election).
As for the British ambassador, the soft-spoken Sir Stephen Wall, he is close to John Major--but for the past two years this has often seemed something of a disadvantage.
John Major had publicly expressed his hope that Sir Gordon's report would be published speedily.
Sir Richard Evans, the boss of British Aerospace, this month attacked John Major for failing to restrain his party's Eurosceptics.
Sir Gus has been a trusted official for three decades, prospering under every prime minister from John Major on.
He and Labour have accumulated too many mistakes and behaved too distastefully, some think, like John Major's cabinet in the mid-1990s (though it was the personality of Sir John's complacent party rather than his own that was the main problem then).
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