On the second day of debate on changes to May's EU withdrawal bill, lawmakers will vote on amendments handed down from the upper house of parliament over Britain's relationship to the bloc's customs union and single market.
And former attorney general Dominic Grieve withdrew his own proposals spelling out precise terms under which MPs should be given a "meaningful vote" on the eventual deal - including the power to dictate what the UK Government should do if no acceptable agreement is reached by February 2019. Just hours earlier, Downing Street had signalled the prime minister had no intention of accepting Grieve's compromise amendment to the European Union withdrawal bill, tabled by the former attorney general and aimed at ensuring ministers can't "crash out of the European Union by ministerial fiat", as he called it.
These should be interesting discussion indeed as, although she had made concessions, May has also said that she will not allow MPs to tie her hands in the Brexit negotiations. Yet another Brexit contradiction it seems and one that rebel, and opposition MPs need to keep a close eye on. Could she already be paving the way to renege? As ever, Delano will keep you posted.
Leading pro-EU Conservative Sarah Wollaston said the "promised further amendment" in the Lords must "closely reflect" the withdrawn proposal.
Failure to appease the rebels would likely see May defeated in parliament in the coming weeks, blowing apart Tuesday's hard-won truce and badly undermining her leadership of a minority government and a divided political party.
On Wednesday the British parliament will vote on an amendment by the House of Lords requiring the House of Commons to explore remaining part of the European Economic Area (EEA), an option often referred to as "the Norway model".
Hours before the debate began, a justice minister resigned in protest at what he called its "wish to limit" the role of parliament in shaping Brexit.
74 Labour MPs rebelled to vote against disagreeing with the Lords EEA amendment and 15 rebelled to vote with the Government in agreeing to reject the Lords EEA amendment.
Losing the vote in the Commons would have spelt serious trouble for Mrs May, whose position as prime minister was weakened a year ago when she lost her parliamentary majority after calling a general election. These kinds of promises by the government are fundamental to the way in which parliament and the government work together to craft legislation that the majority of MPs can live with.
But Britain - and its government - remain divided over Brexit, and European Union leaders are frustrated with what they see as a lack of firm proposals from the U.K about future relations.
A dispute quickly arose about the third clause of Grieve's amendment, with Brexiters, including some ministers, quickly saying all that had been agreed was talks - and no government could agree to be "directed" by MPs.
"What would be the result to our government if we lost this vote today?" asked Conservative lawmaker Edward Leigh.
She told the Commons: "The central choice for Parliament is whenever we accept the outcome of the referendum or do we seek to subvert that process?"
The fact is that the Tory rebels are still split on tactics, with some preferring to hold off until the Trade Bill next month to push a single market solution.
"The decision was taken by the people, we gave them that decision and we have to stand by it", said Conservative MP Bill Cash.