LONDON, Dec. 12 (Xinhua) -- British Prime Minister Theresa May will face a vote of no confidence later Wednesday, said Graham Brady, head of the Conservative Party's 1922 Committee of backbenchers.

The required threshold of 48 letters from members of parliament needed to trigger a vote of confidence in party leadership has been reached, Brady said.

The vote by Conservative Party members will be held between 1800 GMT and 2000 GMT, and the results will be "announced as soon as possible in the evening," he added.

In response, May addressed the media outside 10 Downing Street, saying she will contest the vote of no confidence with everything she has got.

A change of leadership now would create uncertainty "when we can least afford it," May said, adding that the first act of a successor if she loses would have to be extending or rescinding Article 50, the mechanism that started the two-year countdown to Britain leaving the European Union next March.

May said she has devoted herself unsparingly to delivering Brexit, concluding: "I stand ready to finish the job."