Factbox - How will the confidence vote in May's government work?

British lawmakers will on Wednesday vote on whether they have confidence in the government, after Prime Minister Theresa May's Brexit deal suffered a heavy defeat in parliament.Labour leader Jeremy Corbyn will open the debate on the motion at around 1300 GMT.May's government needs 318 votes to win the vote, as seven members of the Irish nationalist Sinn Fein party do not sit, four speakers do not vote and four MPs who help count votes, known as tellers, are not counted.