Speaker Denison's rule

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Mr. Speaker Denison

Speaker Denison's rule is a constitutional convention established by John Evelyn Denison, who was Speaker of the British House of Commons from 1857 to 1872, regarding how the Speaker decides on their casting vote in the event of a tie in the number of votes cast in a division.

The principle is to always vote in favour of further debate, or, where it has been previously decided to have no further debate or in some specific instances, to vote in favour of the status quo.[1][2] Thus, the Speaker will vote:

The thinking behind the rule is that change should only occur if an actual majority vote is in favour of the change.

Speaker Denison's rule is now a guiding principle in many other bodies that have neutral chairpersons.[3]

Tied votes in the House of Commons[edit]

Date Presiding Officer Issue Ayes and Noes Casting vote Reference
3 April 2019 Speaker John Bercow Brexit indicative vote amendment 310 No [4] [5]
22 July 1993 Speaker Betty Boothroyd Treaty of Maastricht (Social Protocol) - the Speaker's vote was later expunged - see note below 317 No [6]
21 June 1990 Deputy Speaker Sir Paul Dean Amendment of Law Relating to Termination of Pregnancy 197 No [7]
30 January 1980 Deputy Speaker Bernard Weatherill Motion for leave to bring in the Televising of Parliament Bill 201 Aye [8]
17 July 1978 Deputy Speaker Godman Irvine That the House disagreed with a Lords amendment to the Scotland Bill 286 Aye [9]
11 November 1976 Deputy Speaker Myer Galpern That the House disagreed with a Lords amendment to the Aircraft And Shipbuilding Industries Bill 309 Aye [10]

There was believed to be a 317–317 vote on an amendment to a motion concerning the Maastricht Treaty on 22 July 1993, but it was quickly discovered that one extra "Aye" vote had been erroneously counted.[11] Prior to the counting error having been noted, Speaker Betty Boothroyd did give a casting vote of "No",[12] although this was later expunged when the error became clear.[13]


  1. ^ MacDonagh, Michael (1914). The Speaker of the House. London: Methuen. p. 74.
  2. ^ Factsheet P9: Divisions (PDF). London: House of Commons Information Office. 2010. p. 6.
  3. ^ "Exercise of the Casting Vote of the Chair". Parliament of New South Wales.
  4. ^ "Brexit: Bercow uses casting vote after first Commons tie in 26 years to block backbench indicative votes - live news". The Guardian. 3 April 2019.
  5. ^ "Business of the House". Hansard - Parliament UK.
  6. ^ "Treaty of Maastricht (Social Protocol)". Hansard - Parliament UK.
  7. ^ "Amendment Of Law Relating To Termination Of Pregnancy". Hansard - Parliament UK.
  8. ^ "Televising Of Parliament". Hansard - Parliament UK.
  9. ^ "Scotland Bill". Hansard - Parliament UK.
  10. ^ "Aircraft And Shipbuilding Industries Bill". Hansard - Parliament UK.
  11. ^ "Points of Order - 23 July 1993". Hansard - Parliament UK.
  12. ^ "Treaty Of Maastricht (Social Protocol)". Hansard - Parliament UK.
  13. ^ "House of Commons: Tied Divisions". United Kingdom Election Results. David Boothroyd. Archived from the original on 5 January 2008. Retrieved 23 June 2009.

External links[edit]