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Channel 5's programme claims that the Queen responded to the news from her private secretary by saying: "Someone must have greased the brakes." Diana: 7 Days That Shook The Windsors will revisit Diana's fatal crash in August 1997, airing comments from "key players" involved in her funeral holding detailed accounts from the time after her death. The TV show's claims also echo royal biographer Ingrid Seward's report in her 2015 book and article. According to the Channel 5 episode, Miss Seward wrote in the Daily Mail: "According to one witness present when the Queen heard the initial news, she mused out loud, ‘Someone must have greased the brakes’.

GETTY The Queen's reaction to Diana's fatal car crash REVEALED in new documentary

GETTY Prince Charles alongside the Queen and the Princess of Wales

GETTY The Queen and Queen Elizabeth at the princess's funeral

Diana: Her fashion story in pictures Thu, February 23, 2017 Celebrate the life of Diana, Princess of Wales, in this major new dress exhibition at Kensington Palace. Trace the evolution of the Princess’s style, from the demure, romantic outfits of her first public appearances, to the glamour, elegance and confidence of her later life. Play slideshow Getty Images 1 of 18 Diana wears a pale blue silk chiffon strapless dress designed by fashion designer Catherine Walker

Someone must have greased the brakes Diana : 7 Days That Shook The Windsors claim

"That astonishing remark reveals something of the extraordinary and complex relationship between her and Diana." Tonight's episode also claims Prince William at the young age of 15 initially refused to join his mother's funeral procession. In a recent interview with the latest issue of GQ, the royal said: "I still find it difficult now because at the time it was so raw. And it is not like most people's grief because everyone knows about it. "It's a different situation for most people who lose someone they love. It can be hidden or they can choose if they want to share their story."

GETTY Earl Spencer, William, Harry and the Prince of Wales walked behind the funeral car

GETTY Mourners left flowers and tributes to the princess outside Buckingham Palace

Princess Diana's charitable work Wed, March 1, 2017 Princess Diana's biggest contribution to AIDS charity work was her public persona, she was one of the first notable people photographed touching and holding HIV/AIDS patients and many experts credit her with removing the stigma associated with AIDS Play slideshow Tim Graham/Getty Images 1 of 11 Diana, Princess of Wales, arrives at the Mortimer Market Centre, a sexual health and aids clinic in London on 1st December, 1994.