The confusion on Wednesday in Parliament, the day before Liz Truss quit as prime minister, led to reports that Government chief whip Wendy Morton and her deputy Craig Whittaker had resigned. It all added to the sense of crisis inside Truss's government which was followed by Thursday's momentous events.
Ahead of the PM's resignation, Number 10 said they remained in post, but events have put the role of whips and how they function back in the spotlight. Here is an explanation of the whipping system in Parliament:
