Question:  Call Me Dave: The Unauthorised Biography of David Cameron is a 2015 book by  the 74th richest person in the UK, as ranked by what?

Context articles: Harold Hamm
Piggate
Johanna Quandt
Wu Yajun
Michael Ashcroft
Call Me Dave
James C. Kennedy
Lu Guanqiu
Benedict Peters
Barry Lam

Harold Glenn Hamm (born December 11, 1945) is an American entrepreneur primarily involved in the oil and gas business who is best known for pioneering the development of the large shale oil resources of the Bakken formation.
 On June 24, 2016, Hamm was ranked by Forbes magazine as the 39th richest person in United States and 98th richest person in the world, with a net worth estimated at $11.3 billion.
 Hamm's net worth peaked at $18.7 billion in September 2014, but decreased to $9.3 billion by 2015.
 In 2012, presidential candidate Mitt Romney named Hamm as his energy advisor and thereafter Hamm made substantial monetary and advisory contributions to the election effort.
"Piggate" refers to an uncorroborated anecdote that during his university years former British Prime Minister David Cameron put a "private part of his anatomy" into a dead pig's mouth as part of an initiation ceremony for the Piers Gaveston Society.
 The anecdote was reported by Michael Ashcroft and Isabel Oakeshott in their unauthorised biography of Cameron, "Call Me Dave", attributing the story to an anonymous Member of Parliament who was a "distinguished Oxford contemporary" of Cameron's.
 Extracts from the book were published in the "Daily Mail" on 21 September 2015, prior to its publication.
Johanna Maria Quandt (née Bruhn; 21 June 1926 – 3 August 2015) was a business woman and the widow of German industrialist Herbert Quandt, who resurrected BMW from bankruptcy.
 When she died in 2015 she was the 8th richest person in Germany (and the richest German woman), 77th richest person in the world, and the 11th richest woman worldwide according to Forbes.
Wu Yajun (; born 1964) is a Chinese businesswoman, co-founder, former CEO and current chairwoman of Longfor Properties.
 She is the third richest woman in China, and the 22nd richest overall, according to the Hurun Report China Rich List 2013.
 In 2012, She held the title of richest woman in China, as well as fifth richest person in China.
 She lost that position to Yang Huiyan due to her divorce from Cai Kui, positioning herself as second richest woman in China.
 As of March 2013 she was the 299th richest person in the world, and among the top 50 Power-women list by Forbes, with a net worth of US$4.4 billion.
 She is a member of the National People's Congress.
 In 2014, she was listed as the 41st most powerful woman in the world by "Forbes".
Michael Anthony P. Ashcroft, Baron Ashcroft, (born 4 March 1946) is a businessman, and politician.
 He is a former deputy chairman of the Conservative Party.
 Ashcroft founded Michael A. Ashcroft Associates in 1972 and is the 74th richest person in the UK, as ranked by the "Sunday Times" Rich List 2015, with an estimated fortune of £1.32 billion.
Call Me Dave: The Unauthorised Biography of David Cameron is a 2015 book by Michael Ashcroft, a businessman and Conservative peer, and Isabel Oakeshott, a political journalist, about the then Prime Minister of the United Kingdom, David Cameron.
 The book, excerpts from which were published in the "Daily Mail" prior to publication, received significant media attention, particularly relating to allegations made about Cameron.
 It is published by Biteback, a company in which Ashcroft has a majority share, run by political blogger Iain Dale.
James Cox Kennedy (born 1948) is an American media executive and the current chair of Cox Enterprises, the media conglomerate founded by his grandfather, James M. Cox.
 According to the Forbes billionaires list from 2017, he is the 105th richest person in the world, the thirty-seventh richest person in the United States, and the richest person in the state of Georgia, surpassing his aunt, Anne Cox Chambers, for the title.
 He was featured in a Forbes article entitled "This Billionaire Knows The Secret To Saving A Family Business".
Lu Guanqiu (; born January 1945) is a Chinese entrepreneur.
 He is the 18th richest person in China, according to the Hurun Report China Rich List 2013.
 He is the 286th richest person in the world, and reportedly the richest person in Zhejiang Province.
 He is a delegate to the Chinese National People's Congress.
Benedict Peters is a Nigerian billionaire, who founded the Aiteo Group, which has interests primarily in energy and is the largest indigenous oil producing firm in Nigeria by output.
 As of November 2014, he had an estimated net worth of US$2.7 billion.
 Peters is ranked by Ventures Africa as the 17th richest person in Africa and the 7th richest person in Nigeria.
 Benedict is married and has four children.
Barry Lam (; born 1949 in Shanghai) is the founder and Chairman of Quanta Computer, the leading laptop producer worldwide.
 He is also a major patron of the arts and a leading philanthropist in the area of culture and education.
 In 2011, Forbes named him as the 376th richest person in the world and 6th richest in Taiwan with a net worth of US$3 billion.
 In 2012, he is cited as the 296th richest person in the world and 5th richest in Taiwan with a net worth of US$4.2 billion.