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“The wedding of Kate and William will be a happy and momentous occasion. We want to mark the day as one of national celebration, a public holiday will ensure the most people possible will have a chance to celebrate on the day,” Cameron said in a statement.

William was 15 when he walked behind his mother’s coffin at Diana’s funeral in the abbey in September 1997.

Several members of his family have wed there, including the queen’s sister. Princess Margaret in 1960, William’s aunt Princess Anne in 1973 and his uncle Prince Andrew in 1986. All three marriages ended in divorce.