If you vote in the wrong lobby by accident you can’t undo the vote, but you can cancel its effect by crossing to the other lobby and voting on the other side, if you have time. Remember to tap your pass against the pass reader in the second lobby: you’ll see a message asking you to confirm that you wish to vote in both lobbies. Then walk out of the lobby past the tellers.
If your name has not been recorded, or you have any problems using your pass, you should inform the Public Bill Office immediately by emailing pbohoc@parliament.uk. If your names needs to be added, please say in your email which way you voted. The email must come from your own parliamentary address.
If the tellers incorrectly report the numbers, they should report the error as soon as possible and ideally before the House has proceeded to the next business. The Speaker will make a statement to the House and ask the Clerk to correct the numbers in the Journal (the record of the House’s decisions). The division will be repeated if the mistake could have reasonably made a difference to the result. If the tellers can’t agree on the numbers, the division has to be re-run.
If you have a point of order during a division, you should approach the Speaker and explain the issue.
Occasionally, the Speaker will rule that a division has been “unnecessarily claimed”. This means that the Speaker had decided that the forcing of repeated divisions by a small number of MPs is an abuse of procedure and is intended to delay the business of the House.
In these circumstances, after two minutes the Speaker will call on those who support and then on those who oppose the motion to stand up. The Speaker will then either declare the result without a division, or, if a division is needed, the Speaker will name the tellers and the division will proceed as usual.