A Guillotine Motion is the common name for an Allocation of Time Motion which is a British House of Commons procedure that can be used to restrict the time set aside for debate during the passage of a bill through the House.
The Standing Orders of the House of Commons do not establish any formal time limits for debates. The Speaker may, however, order a Member who persists in making a tediously repetitive or irrelevant speech to stop speaking, the speaker can not however stop all filibustering, which is made easier for a Member by the rule which allows a Member to give way temporarily to another Member before retaking the baton and continuing his or her speech. The time set aside for debate on a particular motion is, however, often limited by informal agreements between the parties. Debate may, however, be restricted by the passage of "Guillotine Motions". Alternatively, the House may put an immediate end to debate by passing a motion to invoke the Closure. The Speaker is allowed to deny the motion if he or she believes that it infringes upon the rights of the minority.