In December, May chose to postpone a parliamentary vote meant to ratify the agreement at the last minute after it became clear that it would be overwhelmingly defeated in the House of Commons. Five days of debate in the Commons will begin on Wednesday.
May's withdrawal agreement has found opposition from Brexiteers resulting in the prime minister postponing the House of Commons vote before Christmas in face of certain defeat - mainly over the issue of the Irish backstop which could see Northern Ireland locked into regulatory alignment with the bloc after the transition period, should London and Brussels not strike a deal, in order to stop a so-called "hard border" with European Union member state Republic of Ireland.
Britain is testing how its motorway and ferry system would handle a no-deal Brexit by sending a stream of trucks from a regional airport to the port of Dover - even as some legislators try to pressure the government to rule out the scenario.
The Democratic Unionist Party, which props up May's government, was always going to vote against her plan because it's concerned the backstop arrangement would put Northern Ireland on a different regulatory footing to the British mainland.
"Manston should only be used as a last resort".
The Northern Irish Democratic Unionist Party (DUP), which May's ruling Conservative Party relies on to command a majority in parliament, has urged the British leader to stand firm in demanding that the European Union changes its "poison" backstop provision on Ireland's post-Brexit border, however.
On the other side of the Tory divide, pro-EU veteran Ken Clarke said May's deal - which he would be prepared to support - is "dying", and he would be "amazed" if the mood of MPs had changed over the Christmas break.
Analysts said May's comments to the BBC did little to hide the fact the British leader has no "gamechanger" amendments to the proposed withdrawal agreement capable of swinging the parliamentary arithmetic in her favour.
Government sources warned over the weekend of "paralysis" and an effective "shutdown" if the Treasury was stripped of the power to pass regulations relating to "no-deal financial provisions" without parliamentary approval.
"The only way you're going to get on and deliver Brexit is what's called a "no deal" Brexit".
She added: "It will certainly cost me more money and there will probably be more bureaucracy and health checks".
The prime minister was forced to abandon plans to hold a vote on the deal in December after more than a hundred Conservative MPs and the Democratic Unionist Party, which props up May's minority government, vowed to vote against it.
Prominent Brexiteer Peter Bone said a no-deal scenario was the only way to guarantee the United Kingdom actually leaves the EU.
As MPs prepare to return to Westminster with the crunch Commons vote looming on the Withdrawal Agreement thrashed out with Brussels, the Prime Minister said no alternative plan was able to respect the 2016 referendum result, protect jobs and provide certainty to citizens and businesses. Without taking those voters into account, the poll would split 54-46 in favor of remaining.