Edward duly signed the instruments of abdication at Fort Belvedere on 10 December 1936 in the presence of his younger brothers: Prince Albert, Duke of York, next in line for the throne; Prince Henry, Duke of Gloucester; and Prince George, Duke of Kent.
The next day, the last act of his reign was the royal assent to His Majesty's Declaration of Abdication Act 1936. As required by the Statute of Westminster, all the Dominions had already consented to the abdication.
On the night of 11 December 1936, Edward, now reverted to the title and style of a prince, explained his decision to abdicate in a worldwide radio broadcast. He famously said, "I have found it impossible to carry the heavy burden of responsibility and to discharge my duties as king as I would wish to do without the help and support of the woman I love." He added that the "decision was mine and mine alone ... The other person most nearly concerned has tried up to the last to persuade me to take a different course".
Less than a year later, on 11 December 1936, in the abdication crisis, Edward VIII left the throne to marry Wallis Simpson, a twice-divorced American, whom neither the Church of England nor the Dominion governments would accept as queen. The Church would not recognize the marriage of a divorced woman with a living ex-husband as valid. Edward's abdication made a reluctant Duke of York the new King George VI, and Margaret became second in line to the throne, with the title Princess Margaret to indicate her status as a child of the sovereign. The family moved into Buckingham Palace; Margaret's room overlooked The Mall.