Hesitations are a natural part of unscripted spoken language. We all hesitate from time to time while speaking for various reasons: to plan what we want to say next, to correct errors or for dramatic effect. Hesitation is normally apparent in the speech output through repetitions, false starts and pauses (either filled or unfilled).
In a previous post I have argued that the house is a multi-faceted chamber with comments and background noise from members of the chamber combining with the current speaker to create a multi-modal discourse act. This is particularly important during Prime Minister’s questions (PMQs) when the performance of those taking part, particularly the Prime Minister and the Leader of the Opposition, can be just as significant as what they say. Support from members of the chamber at this time can often indicate how well the current speaker is perceived to be doing.