Why do MPs stand up in the House of Commons during PMQs?

But what's the reason behind this? Here's why…

MPs tend to stand up during Prime Minister's Questions to catch the current speaker's attention.

They stand up to indicate to the speaker that they have something to say regarding the topic being discussed.

The speaking order is usually determined in advance and MPs have the option to request to be called to speak.

They can do so if they feel they have expertise in a certain topic.

Backbench MPs wishing to ask a question must enter their names on something called the Order Paper.

Speaking slots at important events such as this are distributed at random by ballot and printed in a document called the “Order Paper”.

The slots in which MPs are allowed to talk are distributed at random.

The speaker will then call on MPs to put their questions, one MP from the government benches is followed by one from the opposition benches.

MPs who are not chosen may be chosen to ask a question if they "catch the eye" of the speaker.

The process of doing this is by standing before the prime minister gives an answer, which is why we see MPs standing.