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Uncertainty over what kind of deal Britain will pursue in some of the most complex talks it has undertaken since World War Two has unsettled investors and markets.
The British currency is particularly sensitive to any suggestion that the country might be heading toward a "hard Brexit", or a clean break from the EU's single market of 500 million consumers in order to control immigration.
Sterling, which has lost 18 percent against the dollar since the June Brexit referendum, rallied on reports that parliament would get to vote on May's deal, but eased slightly after her spokeswoman said there would be no vote on triggering Article 50 of the EU's Lisbon Treaty. This starts the formal negotiation process, lasting up to two years, until Britain's departure.
"The idea that parliament somehow wasn't going to be able to discuss, debate, question ... was frankly completely wrong," May said when asked by an opposition Labour lawmaker whether parliament would get a vote on the government's Brexit plan.
"Parliament is going to have every opportunity to debate this issue."
Increasingly conscious that markets are moving on her words, May was clear that she would be "ambitious" in talks with the other 27 EU members to get what she called the best deal.
"And that will include the maximum possible access to the European market for firms to trade with and operate within," May told parliament, a statement which helped sterling gain around a quarter of a cent against the dollar.
UNDER PRESSURE
Appointed prime minister shortly after the June 23 vote on EU membership, replacing David Cameron who resigned, May has come under pressure to drop her insistence that she will not give a "running commentary" on the Brexit negotiations.
By refusing to debate her strategy, lawmakers say, May is undermining Britain's centuries-old parliamentary democracy. May says she does not want to show her hand before the talks.
"How are you going to build a consensus around your approach if you won't tell this house what your approach is?" Labour Brexit spokesman Keir Starmer said. "The mandate on the 23rd of June was not a mandate on the terms (of a Brexit deal)."
Labour demanded Wednesday's debate and May accepted on condition that it would not undermine her negotiating strategy.
May, a former interior minister, has defended her "prerogative" to trigger the departure without parliamentary approval and her government will defend that position at London's High Court on Thursday, when a legal challenge led by a pro-EU investment fund manager will begin.