Britain's Queen Elizabeth II has granted her formal consent to the wedding of her grandson Prince William and Kate Middleton on April 29.
Under terms of a three-century-old act of Parliament, the Royal Marriages Act of 1772, a British monarch must give formal advance approval of a marriage that could affect the line of succession to the throne.
The "Instrument of Consent" signed by the queen is necessary to ensure the marriage's validity.
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Some information for this report was provided by Reuters.