I was impressed by some of the facts given, that I have learned over the years from a very singular source and haven't heard repeated much from other sources. This fact being that for Diana's wedding... and possibly for Kate's... that three bouquets were made. One for the rehearsal, one for the ceremony, and one for the photos. And, one of those would be returned to the Abbey for placement on the tomb of the Unknown Warrior. Also, the video insert of Sarah, Duchess of your mentions that she carried an "S" shape bouquet... which I know is a fact... learned from my friend David Longman, the man who designed both the royal bouquets in the 1980's.
Hopefully soon, I will be able to show you all what I think/ hope, Kate's bouquet will look like.
Royal Wedding Flower Tid-Bit for the day... The practice of placing the bouquet on the Tomb of the Unknown Warrior began in 1923 by Elizabeth, Duchess of York (in the future to be The Queen Mother) as she recessed down the aisle of Westminster Abbey after her wedding to Albert, Duke of York (in the future, King George VI). The Duchess's brother was one of the casualties of World War I.