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In a special message published in the programme, the couple writes, "We are both so delighted that you are able to join us in celebrating what we hope will be one of the happiest days of our lives. The affection shown to us by so many people during our engagement has been incredibly moving, and has touched us both deeply. We would like to take this opportunity to thank everyone most sincerely for their kindness."

Details of the order of service for the big day have also been released - confirming Middleton will follow in the footsteps of her groom's late mother, Diana, Princess of Wales, by not promising to "obey" her husband.

When the bride says her vows at the ceremony at London's Westminster Abbey, she will promise to "love him, comfort him, honour and keep him".