Question:  Sir Anthony Francis Seldon is known in part for his biography of a British politician who identifies as what?

Context paragraphs:
Earl of Westmeath: Earl of Westmeath is a title in the Peerage of Ireland.  It was created in 1621 for Richard Nugent, Baron Delvin.  During the Tudor era the loyalty of the Nugent family was often in question, and Richard's father, the sixth Baron, died in prison while awaiting trial for treason.  Richard himself when young was suspected of plotting rebellion and imprisoned, but in later life was a staunch supporter of the Crown, which rewarded him richly for his loyalty.  The fifth Earl was a Major-General in the British Army.  The sixth Earl was sworn of the Irish Privy Council in 1758.  His son by his first wife, Richard Nugent, Lord Delvin, was killed in a duel at an early age.  Lord Westmeath was succeeded by his second son by his second wife, the seventh Earl.  He sat in the House of Lords as one of the original 28 Irish Representative Peers; he was also involved in a much-publicised divorce and action for criminal conversation.  He was succeeded by his son, the eighth Earl.  He was created Marquess of Westmeath in the Peerage of Ireland in 1822.  He had no surviving male issue and the marquessate became extinct on his death in 1871.  He was succeeded in the barony and earldom by his kinsman, Anthony Francis Nugent, the ninth Earl.  The eleventh Earl was an Irish Representative Peer from 1901 to 1933.

Anthony Seldon: Sir Anthony Francis Seldon, {'1': ", '2': ", '3': ", '4': "} (born 2 August 1953), is Vice-Chancellor of the University of Buckingham, a contemporary historian, commentator and political author, known in part for his biographies of Margaret Thatcher, John Major, Tony Blair, Gordon Brown and David Cameron.  He was the 13th Master (headmaster) of Wellington College, one of Britain's co-educational independent boarding schools.  In 2009, he set up The Wellington Academy, the first state school to carry the name of its founding independent school.

David Cameron: David William Donald Cameron ( ; born 9 October 1966) is a British politician who was Prime Minister of the United Kingdom from 2010 to 2016 and Leader of the Conservative Party from 2005 to 2016.  He was Member of Parliament (MP) for Witney from 2001 to 2016.  Cameron identifies as a One-Nation Conservative, and has been associated with both economically liberal and socially liberal policies.

Tony Arbour: Cllr Anthony Francis Arbour JP AM (born 30 August 1945), commonly known as Tony Arbour, is a British Conservative Party politician, a Richmond councillor and member of the London Assembly representing South West London.

G20 Schools: G20 Schools is an informal association of secondary schools initiated by David Wylde of St. Andrew's College, Grahamstown (South Africa) and Sir Anthony Seldon of Wellington College (UK) in 2006.

Anthony Beaumont-Dark: Sir Anthony Michael Beaumont-Dark (11 October 1932 – 2 April 2006) was a British politician.

Tony Steedman: Anthony Francis Steedman (21 August 1927 – 4 February 2001) was an English character actor, perhaps best known for roles in British TV drama series of the 1970s and 1980s and for his role as Socrates in "Bill & Ted's Excellent Adventure".

Anthony Berry: Sir Anthony George Berry (12 February 1925 – 12 October 1984) was a British politician, the Conservative Member of Parliament for Enfield Southgate, and a Whip in Margaret Thatcher's government.  He was killed in the Brighton hotel bombing.

Debasement (knighthood): Debasement is the formal term for removal of a knighthood or other honour.  The last knight to be publicly debased was Sir Francis Mitchell.  More recent examples include Sir Roger Casement, whose knighthood was canceled for treason during the First World War, and Sir Anthony Blunt, whose knighthood was withdrawn in 1979.  The most recent debasements centre on the fallout from the banking crisis at the end of the first decade of the twenty-first century.  Examples include Sir Fred Goodwin, the former Chief Executive of the Royal Bank of Scotland, who lost his knighthood in 2012 over his role in the bank's near-collapse in 2008 and Sir James Crosby, the former Chief Executive of HBOS.

Henry Ughtred: Sir Henry Ughtred (1533 – 1598 ), also known as Oughtred, was an English Member of Parliament, a shipowner and shipbuilder during the reign of Elizabeth I.  One of his ships, the "Leicester" sailed with Sir Francis Drake against the Spanish Armada.  A wealthy landowner, Sir Henry is known to have played an active role in the Plantations of Ireland and was knighted by the Lord Deputy of Ireland in 1593.  He was the son of Sir Anthony Ughtred and Elizabeth Seymour, sister to Jane, the third wife of Henry VIII.  After 1557 he married Elizabeth Paulet, the daughter of John Paulet, 2nd Marquess of Winchester and widow of Sir William Courtenay.

Supporting paragraphs: Anthony Seldon David Cameron
Answer: a One-Nation Conservative