The greatest threat is an amendment forcing the UK to enter a customs union with the EU after Brexit. Last time the issue was voted on by MPs, during a series of indicative votes attempting to break the Brexit impasse back in April, it failed to pass by a slim margin of three.
Since then, however, a significant number of Conservative MPs have changed their minds and are rallying behind Mr Johnson’s deal. This is particularly notable in the one nation group of moderate Tories, whose members do not wish to stop Brexit even if in private they might prefer a customs union.Paul Masterton, a one-nation Tory MP, explained the circumstances for voting had changed. “We now have a new deal and MPs need a clean vote on whether or not to approve it. These amendments are designed to wreck the progress that has been made,” he said.
All parties opposed to Brexit are likely to vote for the customs union amendment to wreck Mr Johnson’s deal, except the Scottish National party whose 35 MPs are expected to abstain or vote against in order to state their fundamental opposition to Brexit.Northern Ireland’s Democractic Unionist party has not yet decided how to vote. If the SNP and the DUP’s 10 Westminster MPs vote against, the customs union amendment would fail by 89 votes. If both abstain it would fail by 44.