The hallway situated next to the House of Commons chamber at the end of the corridor leading to the central lobby is known as the Members' Lobby.
The government and opposition whips' offices are situated in the lobby, as well as the Members' Post Office and the Members' Vote Office.
MPs can also collect letters and urgent messages from the two message boards located in the lobby.
MPs congregate here during the sittings of the House and before and after divisions.
While the House is voting, members of the public are not allowed to enter the lobby.