1951-1955: Churchill's second premiership (PA Images)

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As you'd expect, considering she's been on the throne for so long, Queen Elizabeth has seen her fair share of Prime Ministers: the current premier David Cameron is the twelfth person to head up the UK government under her. Her first was, remarkably, Britain's iconic wartime leader Winston Churchill during his second stint in 10 Downing Street between 1951 and 1955.