The King sent a meaningful show of support after visiting the 9/11 memorial earlier this year

When the inevitable happens, the United Kingdom is already said to be planning a massive, $200million funeral. According to the top-secret plans, Charles' send-off will include honors at Westminster Abbey, and the guest list is expected to include hundreds of foreign royals and dignitaries, political and religious leaders, and several friends.

Queen Elizabeth ordered Buckingham Palace guards to play the U.S. national anthem following Sept. 11. King Charles is doing the same, 25 years later.

Read what King Charles first thought about his daughter-in-law Princess Kate and how she was handling her royal duties

The granddaughter of ICI tycoon Lord McGowan, she had her three sons, Tom, Billy and Henry, by her side when she passed away on September 2 following a short illness.

The royal couple have often been pictured laughing and enjoying each other's company. Their relationship has been far from plain sailing, but the royal couple got their happy ending 35 years after they first met. Here, the Daily Express takes a look at the King and Queen's best moments together through the years.

The Band of the Coldstream Guards performed songs including “Hymn to the Fallen” from ‘Saving Private Ryan’ and “Amazing Grace”

The King's favourite breakfast is very simple to make.