Prince William and Kate Middleton say they have been "incredibly moved" by the affection shown to them since their engagement.

In a message printed at the beginning of their official wedding programme, the couple say they are deeply touched by people's reactions as they prepare for "one of the happiest days of our lives".

The words of the bride and groom were released as it was revealed that Friday's traditional wedding service will be the epitome of "Britishness".

William and Kate's message reads: "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."

The keepsake official souvenir programme, which includes the full Order of Service for the marriage ceremony, also features a new black and white portrait of the couple by the celebrated fashion photographer Mario Testino.

In a close-up shot, both the Prince and Miss Middleton are wearing matching open-necked white shirts and are smiling broadly, with Kate leaning towards William.

In the much anticipated service, the music of famous classical favourites by Elgar, Britten and Vaughan Williams will all sound out around the ancient abbey.

From the popular hymn Jerusalem to the quintessential English melody Greensleeves, the couple have embraced the nation's musical heritage in their choice of choral pieces and compositions.

It was also revealed that Kate will not promise to "obey" her new husband in her vows but instead to "love, comfort, honour and keep" him, with the couple using the Series One (1966) Book of Common Prayer ceremony.

William's father the Prince of Wales and stepmother the Duchess of Cornwall and Kate's parents Carole and Michael Middleton and sister Pippa will all act as witnesses and sign the historic marriage registers during the ceremony on Friday.