What does the Speaker do, and what is a whip?
One enforces the rules impartially; the other enforces party discipline ruthlessly. They are the two figures most visible in Commons procedure and they work in opposite directions.
The Speaker. The presiding officer of the House of Commons, elected by MPs. The role is defined by impartiality:
On election, the Speaker leaves their party and does not vote except to exercise a casting vote in a tie — and by convention that vote is cast to allow further debate or to maintain the status quo, not to express a view.
They are not opposed by the main parties at general elections, by convention.
What they actually do: call MPs to speak and decide who gets in; enforce order and can suspend or name an MP for disorderly conduct; rule on points of order; decide whether to grant urgent questions, which forces a minister to come and answer on a topic that day; select amendments for debate, which is a genuinely consequential power; and represent the House externally.
Deputy Speakers share the chair, and the Lord Speaker presides in the Lords with far fewer powers, since the Lords is largely self-regulating.
Whips. Party officials responsible for managing their MPs and delivering votes.
The name comes from the "whipper-in" who kept hounds together in a hunt.
The weekly whip is a document listing forthcoming business, with lines underlined to indicate importance. A one-line whip is a request; a two-line whip means attend unless paired; a three-line whip is an instruction, and defying one is a serious breach. Persistent defiance can lead to having the whip withdrawn — effectively suspension from the parliamentary party, leaving the MP sitting as an independent.
What whips actually do, beyond enforcement: count likely votes, negotiate with rebels, arrange pairing so absences cancel out, manage the parliamentary timetable through the usual channels, gather intelligence on party opinion, and handle members' personal problems — a pastoral function that is genuine and also a source of leverage.
The Chief Whip attends Cabinet, which indicates how central the function is.
General information about the UK Parliament.