Investors also stand to profit from PPPs -- that's why they invest in the first place -- so it's in their interest to attract motorists through efficient operation, rigorous safety standards, and fast, thorough repairs.
Thorough congressional investigations would no doubt help reveal the extent of the operation, and the criminal investigation announced by the Justice Department on Tuesday may prove fruitful as well.
Turning to events after the war, Sir Christopher said UK co-operation in the mission should have been contingent on a thorough post-war plan for Iraq but, instead, the UK was "taken for granted".