The funeral will take place on Saturday (early Sunday NZ time).
The palace has been sharing several photos of the late Prince before the funeral. A series posted this morning reflects on the couple's loving marriage.
"The Queen and The Duke's enduring marriage has seen them support each other through many years of royal duties and raising a family together," the Royal Family Twitter account shared.
And there will be "unique touches" from Philip during the funeral.
The Duke helped design a Land Rover which will carry his coffin, and his two ponies, Balmoral Nevis and Notlaw Storm, will pull a carriage designed by The Duke of Edinburgh.
It is understood the Queen was at the side of her husband of 73 years when he died "peacefully" last week.
The Duke of Edinburgh spent his final days at the castle with his wife, who he lovingly called Lilibet throughout their long life together, after a 28-night stay in hospital, having been admitted in mid-February for an infection and a pre-existing heart condition. They had been married for 73 years. His wife has been Queen for 69 of those years.