Royal guests get advance warning
Foreign heads of state and royalty are the first to receive official "notification" about Prince William and Kate Middleton's wedding.
Faxes have been sent to European royals and world leaders, asking them to keep April 29 free.
One royal couple have already replied on their website to what was described as a wedding "invitation".
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Hide AdAlexander Karadjordjevic, Crown Prince of the former Yugoslavia, and his wife Crown Princess Katherine stated: "Their Royal Highnesses are delighted to attend the marriage and are very happy for the young couple."
A number of other European royals have reportedly confirmed they will attend.