The Iranian people finally rose against the imperial influence of the British and ejected all British citizens in the early years of the fifties. Mossadegh, the prime minister, rose to prominence on an anti-english platform, initially demanding a 50% share of profits and reasonable treatment of Iranian labour. The British, under Attlee as well as with Churchill back in control, selfishly rejected all attempts at comproimise, and produced several internal reports that spoke of how inferior the Iranians were as a race.
Finally, having lost their influence, the English turned to the US for assistance in overthrowing the democratically elected government. Truman resisted, but Eisenhower relented, with John Foster Dulles enthusiastically moving forward with a coup. The Shahs absolute power was reestablished, and his oppressive rule paved way for the Islamic revolution two decades later.
One of many illustrative examples of how the English could never be considered benevolent rulers.
(As described in All the Shah's men, by Stephen Kinzer)