Question: The prince who works with David Manning and The Duke and Duchess of Cambridge is in what succession to the British throne?

Context articles: Prince George of Cambridge
Amanda Pullinger
Prince Harry
David Manning
Sarah, Duchess of York
Princess Charlotte of Cambridge
Prince Christian of Hanover (born 1985)
David Manning (fictitious writer)
Duchess Eilika of Oldenburg
Princess Beatrice of York

Prince George of Cambridge (George Alexander Louis; born 22 July 2013) is the elder child and only son of Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge.
 He is third in line of succession to the British throne, after his paternal grandfather, and father.
Amanda Pullinger is the Chief Executive Officer of 100 Women in Finance, formerly 100 Women in Hedge Funds.
 Ms. Pullinger has led the organization in its growth from a few hundred members in New York to more than 15,000 members in 21 cities globally.
 100 Women launched its new name and branding at the Closing Bell of the NYSE on December 14, 2016 In 2009, she succeeded in bringing in Britain’s Prince William, Duke of Cambridge as the Patron of 100 Women in Hedge Funds.
 Ms. Pullinger welcomed The Duke and Duchess of Cambridge to the 100WHF's London Gala in 2011.
 In late 2012, it was announced that the Duke and Duchess of Cambridge, and Prince Harry would all be Patrons of 100WHF's Philanthropic Initiatives beginning in January 2013.
 In October 2013, a day after the Royal Christening of Prince George, Ms. Pullinger welcomed HRH The Duchess of Cambridge to 100WHF's London Gala for the benefit of Action on Addiction.
 She then welcomed HRH The Duchess of Cambridge to 100WHF's 2015 Gala in London for the benefit of The Art Room.
Prince Henry of Wales {'1': ", '2': ", '3': ", '4': "} (Henry Charles Albert David; born 15 September 1984), familiarly known as Prince Harry, is the younger son of Charles, Prince of Wales, and Diana, Princess of Wales.
 At the time of his birth, he was third in line of succession to the British throne, after his father and elder brother, but is currently fifth in line after his father, his elder brother, and his nephew and niece, George and Charlotte.
Sir David Geoffrey Manning, {'1': ", '2': ", '3': ", '4': "} (born 5 December 1949) is a former British diplomat, who was the British Ambassador to the United States from 2003 to 2007.
 He authored the so-called "Manning Memo" summarising the details of a January 2003 meeting between American president George W. Bush and British prime minister Tony Blair during the run-up to the invasion of Iraq.
 He has since been appointed to the Household of TRH The Duke and Duchess of Cambridge and Prince Harry.
Sarah, Duchess of York (Sarah Margaret; "née" Ferguson; born 15 October 1959) is a British writer, charity patron, public speaker, film producer and television personality.
 She is the former wife of Prince Andrew, Duke of York, the second son of Queen Elizabeth II and Prince Philip, Duke of Edinburgh.
 She is the younger daughter of Major Ronald Ferguson and Susan Barrantes (née Wright).
 Sarah has two daughters, Princesses Beatrice and Eugenie of York, who are respectively seventh and eighth in the line of succession to the British throne.
Princess Charlotte of Cambridge (Charlotte Elizabeth Diana; born 2 May 2015) is the younger child and only daughter of Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge.
 She is fourth in line of succession to the British throne, after her paternal grandfather, her father, and her elder brother.
Prince Christian of Hanover (Christian Heinrich Clemens Paul Frank Peter Welf Wilhelm-Ernst Friedrich Franz Prince of Hanover, Duke of Brunswick and Lüneburg; born 1 June 1985) is the younger son of Ernst August, Prince of Hanover, and his first wife Chantal Hochuli.
 He is the second in the line of succession to the former Hanoverian throne, after his elder brother Prince Ernst August.
 As a descendant of George III of the United Kingdom, Christian is also in the line of succession to the British throne.
David Manning (sometimes "Dave") was a pseudonym used by a marketing executive working for Sony Corporation around July 2000 to give consistently good reviews for releases from Sony subsidiary Columbia Pictures.
 Several fictional review quotes attributed to "David Manning" were used in the promotion of medieval action/drama "A Knight's Tale" (describing Heath Ledger as "this year's hottest new star!")
 and Rob Schneider's comedy "The Animal" ("Another winner!")
, the latter of which generally received mixed to poor reviews by real critics.
Duchess Eilika of Oldenburg (née Duchess Eilika Helene Jutta Clementine of Oldenburg) (born 22 August 1972) is the wife of Georg von Habsburg, the third in the line of succession to the former Austro-Hungarian throne.
 She was in line of succession to the British throne before her marriage to a Roman Catholic.
 She is a daughter of Duke Johann of Oldenburg and his wife Countess Ilka of Ortenburg.
 Her father is a younger son of Nikolaus, Hereditary Grand Duke of Oldenburg and his wife Princess Helena of Waldeck and Pyrmont.
Princess Beatrice of York (Beatrice Elizabeth Mary; born 8 August 1988) is the elder daughter of Prince Andrew, Duke of York, and Sarah, Duchess of York.
 Prior to the birth of Princess Charlotte in 2015, Beatrice was the highest ranking female in the line of succession, and is now seventh in line of succession to the British throne.