While the pound had weakened sharply against the euro and the dollar just before the result, it subsequently trimmed losses across the board after May said Wednesday's vote, when lawmakers will vote on whether Britain should exit the European Union without a deal, would be a free one.
Mr Cox's advice was issued the morning after Mrs May's dash to Strasbourg to finalise a deal with European Commission president Jean-Claude Juncker which she said would deliver "legally-binding" reassurances for MPs to ensure the Irish backstop can not be permanent.
"And more and more people, who previously voted for "Remain", are now supporting "Leave", he said.
The divisions among senior ministers - and Theresa May's struggle to assert her authority over them - were highlighted at a fractious Cabinet meeting ahead of the Commons divisions. "Maybe I shouldn't let you do it, I'll just get you in trouble".
Mrs May's plans for delay were backed by 112 Tories, 236 Labour MPs and 65 other opposition MPs and independents.
Earlier, MPs rejected both the deal negotiated with the European Union by Prime Minister Theresa May's cabinet, and the option to leave the European Union with no deal at all, which the government asked to leave on the table to keep pressure on Brussels.
Ireland's leader, Leo Varadkar, said the developments were positive and that the deal agreed Monday night was "complementary" to the withdrawal agreement.
Charles Walker, a Conservative MP, said that a general election was now the way out of the impasse.
The British parliament will vote later Tuesday on whether to back the withdrawal agreement, after May returned from meetings in Strasbourg brandishing what she said were new guarantees from Europe.
"It may be thought that if both parties deploy a honest desire to reach agreement and the necessary diligence, flexibility and goodwill implied by the amplified duties set out in the Joint Instrument, it is highly unlikely that a satisfactory subsequent agreement to replace the Protocol will not be concluded".
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Share your thoughts in the comment box below and also stay tuned to PhoneRadar for more such interesting updates. Clary recommends that users wear their device "in a lanyard around [their] neck" or in a shirt's front pocket .
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On Nintendo Switch, the Bedrock version of Minecraft also uses Xbox Live to enable crossplay with other platforms. Regardless, Microsoft's GDC 2019 panel will definitely be one to watch, as Xbox Live is about to blow up.
Labour MPs who voted for a second referendum included David Lammy, Owen Smith and Siobhain McDonagh, considered by some as the most likely to defect to TIG.
Underlining her deal, which saw a historic defeat in January, needed legally binding changes, May said "today we have agreed them".
"There will be no third chance", he said.
May said it is time for British lawmakers to come together to back what she called an improved Brexit deal and to fullfil their promise to the British people.
He said: "I would like to stress that the United Kingdom's withdrawal should be complete before the European elections that will take place between 23-26 May this year". Brexit forces the issue because once Britain leaves the European Union, the border between Ireland and Northern Ireland will be the sole land border between the EU and the UK.
"It is not - these doubts and fears can be put to bed".
Dutch Prime Minister Mark Rutte tweeted that he was "pleased with the agreement" and implored that British legislators approve the deal.
Sterling, jumped as high as $1.3290 as some investors bolstered bet the prime minister could secure a divorce deal before Britain's scheduled March 29 departure from the EU.
A significant number of MPs want a second referendum.