The useful vote took place on January 15, 2019 in the House of Commons.  The vote was originally scheduled to take place on December 11, 2018, but on December 10, May postponed it because it became clear that the government`s Brexit deal would be rejected.   But while some Conservative MPs who are skeptical of Brexit certainly voted against the deal, it is far from history. However, many would only support the Conservative government if they feared Britain would be on the brink of a Brexit without a deal. Only five Labor MPs supported the deal: John Mann, Rosie Cooper, Kevin Barron, Jim Fitzpatrick and Caroline Flint. Two others, Dennis Skinner and Ronnie Campbell, abstained. Some of those who supported the government will likely face a counter-reaction from grassroots activists, with the threat of impeachment. In other words, six of the seven high-level ministers who entered government as part of the Johnson administration voted against the agreement. Two Conservative MPs voted against the government, 29 abstained or did not vote, including Theresa May.
After voting on the third vote and the approval of the Cooper-Letwin Act at third reading by 313-312, May and her cabinet considered the possibility of bringing the withdrawal agreement back to Parliament for a fourth vote.  In mid-May, May said she would present the withdrawal agreement to Parliament in the first week of June.  Due to massive opposition to the new agreement, May postponed publication from 24 May to 4 June and subsequently resigned as Prime Minister.  If the British Parliament voted against the agreement, the government would have to present an alternative, a „Plan B“.  As a result, Grieve has tabled an amendment to the business request that deals with the procedure if Parliament votes against the agreement.  The amendment states (italic amendment):  Theresa May reduced the number of Tory MPs who were willing to vote against her Brexit deal on Friday, but she underestimated the intransigence of hard-line Eurosceptics within her own party. In the vote, 286 MEPs voted in favour of their agreement, 344 voted against and 4 abstained. 34 Tories abstained. It is common knowledge that there have been significant differences within the Conservative Party on Brexit, which is clearly illustrated by the magnitude of the defeat on 15 January – 118 Tory MPs (more than a third of the total) voted against the government in that first vote on the deal. The House of Commons voted in favour of the withdrawal agreement by 329 votes to 299, which, after months of negotiations with Brussels and its backs, won a big victory for the Prime Minister.
On September 4, the Benn Bill adopted second reading at 329 to 300; The 22nd Conservative Caroline Spelman voted against the government`s position.  Later that day, MPs rejected Johnson`s request to declare a general election in October because they failed to secure the two-thirds majority required by the Temporary Parliaments Act by 298 votes to 56. Labour MPs abstained.  This is the BBC political correspondent Iain Watson. He says up to 30 Labour MPs abstained from voting on the Brexit bill this afternoon or did not abstain. Charles Michel, President of the European Council, welcomed the vote and tweeted that it was an „important step in the process of ratifying Article 50“. He added that „equal conditions of competition remain a must for all future relations.“ He recalled the EU`s call for fair competition in exchange for a free trade agreement with zero tariffs and zero quotas. The European Parliament expects the withdrawal treaty to be ratified on 29 January, when the next steps at Westminster go ahead as planned and pave the way for the UK to leave the EU on 31 January. Opposition parties, including Labour, the Liberal Democrats and the SNP, have consistently voted against the deal (with the exception of a small handful of Labour).