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As the nation celebrates her 90th birthday, it's impossible to picture a world in which Elizabeth II was not our queen. Most of Britain has never known a time when she did not occupy the throne.
Our finest national asset, she has been a bulwark against changing and often unsettling times. Yet, she might never have been Queen.
The Times can reveal a previously unseen cabinet document that could have scuppered Elizabeth's chances of rising to the throne.
Written by a civil servant before the 1936 abdication, it sought to change the royal landscape after King Edward VIII fled the country in pursuit of "the woman I love".
In a few short words, the handwritten note proposed that instead of putting Edward's younger brother, Bertie, on the throne their mother, Queen Mary, should instead become regent. She would rule without becoming the sovereign. It was hoped that Princess Elizabeth's glamorous uncle Prince George, Duke of Kent, would later become king.
The plan, if enacted, would mean that today the Queen would be no more than a fringe royal, probably known as the Duchess of Edinburgh. Her children, Charles, Anne, Andrew and Edward, would be distant figures on the horizon, her grandchildren, William and Harry, not princes but commoners with day jobs to go to.
Behind the two-page note is a tale of court intrigue that matches the Tudors for its deviousness and cunning. Hatched by desperate politicians and scheming civil servants, it was the establishment's Plan B to save the royal family for generations to come.
Princess Elizabeth was ten years old when she learnt that her Uncle David was quitting. She was told that, as a consequence, the crown would one day be hers. For now, her father, the Duke of York, would be king.
But things were not that simple. The royals themselves believed absolutely in the rule of primogeniture but others did not necessarily see it that way.
While King Edward VIII wavered over quitting the throne in the dying days of 1936, his brother Bertie was being primed for the job in a series of secret meetings with the prime minister, Stanley Baldwin, at No 10. Baldwin encouraged the reluctant prince to see himself as king material.
With doubts still in his mind, Bertie left London for an engagement in Scotland. During his five-day absence at the beginning of December civil servants cooked up their plot to deprive him of the throne.
At the heart of the intrigue was Sir Horace Wilson, an arch-manipulator employed in a freelance role to advise Baldwin. He was supported by two mandarins, the first parliamentary counsel, Sir Maurice Gwyer, and the treasury solicitor, Sir Thomas Barnes.
History relates that Baldwin played an honourable role as the abdication crisis unfolded but the same could not be said of these men. Wilson -- whose Machiavellian antics were described in House Of Cards creator Michael Dobbs's book Winston's War -- was urging the prime minister to push Edward into abdicating earlier. Gwyer and Barnes were obligingly finding ways to further Wilson's determination to influence events.
Seen at this distance, it is clear that there was a pincer-movement by these three officials, and others, to bring about a chain of events that would see Edward VIII off the throne and a cherry-pick his successor.
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