Question: Sir Oliver Bury Popplewell chaired the inquiry into a stadium fire that killed how many people?

Context paragraphs:
Wentworth family: The members of the Wentworth family of both the U.S.A and Australia, as listed below, are descended from Thomas Wentworth and Jane, the daughter of Sir Oliver Mirfield.  Sir Oliver died about 1522.  The American Wentworths are descended from Thomas' son Oliver.  The Australian Wentworths are descended from another son Roger.  The Wentworth family, along with the Arden family, the Berkeley family and the Swinton family, is descended in the male line from pre-Norman Conquest Anglo-Saxon roots.

Grenfell Tower Inquiry: The Grenfell Tower Inquiry is a British public inquiry into the Grenfell Tower fire, which, for a time, was believed to have killed at least 80 people and destroyed Grenfell Tower on 14 June 2017, was ordered by Prime Minister Theresa May on the following day.  May announced on 29 June 2017 that the inquiry would be chaired by retired judge Sir Martin Moore-Bick, with the immediate priority "to establish the facts of what happened at Grenfell Tower in order to take the necessary action to prevent a similar tragedy from happening again."  She stated that "No stone will be left unturned by this inquiry."

Stafford Heginbotham: Stafford Heginbotham (12 September 1933 – 21 April 1995) was a British businessman and chairman of Bradford City football club at the time of 56 deaths in the Bradford City stadium fire, which occurred immediately after the club won league promotion that mandated a costly upgrading of spectator facilities.  A 2015 book revealed the extent of Heginbotham's fire insurance claims before the disaster, which had led to him being the subject of local innuendo about arson.  In the light of the book's revelations the head of a 1985 public inquiry into the disaster maintained there was still no reason to think there had been anything sinister about the stadium fire, although he acknowledged it was cause for suspicion that Heginbotham had been a serial insurance claimant.

Bradford City stadium fire: The Bradford City stadium fire occurred during an English League Third Division fixture between Bradford City and Lincoln City on Saturday, 11 May 1985, killing 56 and injuring at least 265.

Sir Oliver Mowat Collegiate Institute: Sir Oliver Mowat Collegiate Institute (Sir Oliver Mowat CI, SOMCI, or Mowat) is a public high school located in Toronto, located in south east Scarborough governed by the Scarborough Board of Education until 1998 when it became the part of the newly formed Toronto District School Board.  Its motto is "De Monte Alto" ("From a mount high").

Franks Report (1957): The Franks Report of 1957 was issued by a British committee of inquiry chaired by Sir Oliver Franks in respect of growing concerns as to the range and diversity of tribunals, uncertainty about the procedures they followed and worry over lack of cohesion and supervision.  The catalyst for this was the Crichel Down Affair.  However, this was a result of a decision by the British Government and the Franks committee was told to limit its discussion to formal statutory procedure and not to go into decisions of the courts or one-off decisions, which excluded the "Crichel" decision.

Leveson Inquiry: The Leveson inquiry is a judicial public inquiry into the culture, practices and ethics of the British press following the News International phone hacking scandal, chaired by Lord Justice Leveson, who was appointed in July 2011.  A series of public hearings were held throughout 2011 and 2012.  The Inquiry published the Leveson Report in November 2012, which reviewed the general culture and ethics of the British media, and made recommendations for a new, independent, body to replace the existing Press Complaints Commission, which would have to be recognised by the state through new laws.  Prime Minister David Cameron, under whose direction the inquiry had been established, said that he welcomed many of the findings, but declined to enact the requisite legislation.  Part 2 of the inquiry was to be delayed until after criminal prosecutions regarding events at the "News of the World", but the Conservative Party's 2017 manifesto states that the second part of the inquiry will be dropped entirely.

The Sea Hawk: The Sea Hawk is a novel by Rafael Sabatini, originally published in 1915.  The story is set over the years 1588–1593 and concerns a retired Cornish seafaring gentleman, Sir Oliver Tressilian, who is villainously betrayed by a jealous half-brother.  After being forced to serve as a slave on a galley, Sir Oliver is liberated by Barbary pirates.  He joins the pirates, gaining the name "Sakr-el-Bahr" (the hawk of the sea), and swears vengeance against his brother.

List of witnesses of the Iraq Inquiry: This is a list of witnesses of the Iraq Inquiry, sorted chronologically, who have given testimony to the Iraq Inquiry, a British public inquiry into the United Kingdom's role in the Iraq War.  The inquiry, chaired by career civil servant Sir John Chilcot, commenced on 24 November 2009.  From November to December 2009, the witnesses were primarily civil servants and military officials including Tim Cross and Sir Peter Ricketts.  Following a Christmas break, the inquiry heard predominantly from politicians, including former cabinet ministers, including Gordon Brown as well as Tony Blair, Prime Minister at the time of the invasion.  The Iraq Inquiry adjourned in March 2010 to avoid influencing the general election campaign and the last witnesses gave testimony in June 2011.  On 6 July 2016 Sir John Chilcot published the report, more than seven years after the inquiry was announced.

Oliver Popplewell: Sir Oliver Bury Popplewell (b.August 15, 1927, Northwood, Middlesex), is a former British judge and cricket player.  He chaired the inquiry into the Bradford City stadium fire, presided over the libel case brought by Jonathan Aitken MP against "The Guardian" newspaper which eventually led to Aitken's imprisonment for perjury, and was widely reported for asking "What is Linford's lunchbox?"  during a case over which he was presiding, brought by Linford Christie.  He played first-class cricket for Cambridge University and was president of the Marylebone Cricket Club from 1994-96.  He wrote a book about his legal career.

Supporting paragraphs: Oliver Popplewell Bradford City stadium fire
Answer: 56