MPS will head to the House of Commons to cast their meaningful vote on the Prime Minister's Brexit deal tomorrow night.
But where do MPs actually go to vote before the results of the withdrawal deal vote are declared?
ITV News uploaded a video with the answer.
How do MPs actually cast their votes and what happens if the prime minister loses?
— ITV News (@itvnews) January 14, 2019
Take the behind-the-scenes tour of the Commons ahead of crunch Brexit decision https://t.co/lopFXMKxKS pic.twitter.com/eknemKg9nz
The video reveals that to cast their votes, MPs walk down one of two division lobbies, one in backing Theresa May on her deal and the other opposing it. There are tellers in place who count the number of people walking through the different lobbies.
The division lobbies are one of the most important rooms in the country but are rarely allowed to be shown on TV.
The vote will take place at 7pm if Theresa May doesn't cancel it again. MPs will be voting for at least a couple of hours as they vote on more than six amendments to May's Brexit deal – before the crucial vote on the agreement.
When the votes have been cast everyone will go back into the Commons Chamber to hear the result.
In the unlikely event of MPs backing May's deal, the deal will be written into law before the March 29 deadline.
If May loses she will have just three days to come back to the Commons with another plan.
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