The Brexit party leader was visiting Dartford, Gravesend and Rochester in Kent to drum up support for tomorrows' European Union elections.
But her last gambit, offering the prospect of a possible second referendum and closer trading arrangements with the European Union, triggered a revolt by some Brexit-supporting ministers including the resignation of Andrea Leadsom on Wednesday. All through this time the United Kingdom is free to leave as soon as it has passed the Brexit divorce deal.
The Brexit process, or the Article 50 procedures that began over two years ago, should have seen Britain leave the European Union in time to sit out the elections, but an unplanned extension of the process - until October 31, 2019, at least under the current Brexit schedule - has left Britain obliged to participate in the election cycle.
"In all the other places he stopped off and walked down the high street".
Spain and France get five more seats, Italy and the Netherlands get three, Ireland two and a host of other states - Germany, Denmark, Estonia, Croatia, Sweden, Romania, Slovakia, Austria, Poland - receiving one more seat.
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The U.S. investment bank JPMorgan raised its probability of a no-deal Brexit to 25% from 15%, saying its base case was that Johnson became prime minister, followed by a parliamentary election and then another delay to Brexit.
The Brexit Party leader, 55, was alerted and told to get back on the bus.
The Times newspaper reported that May would name a date for her departure on Friday.
"I will be meeting the prime minister on Friday following her campaigning in the European elections tomorrow and following that meeting I will be consulting with the 1922 executive", 1922 Committee chairman Graham Brady told reporters. May will remain as prime minister while her successor is elected in a two-stage process, the newspaper said.
Citizens in the United Kingdom are among the first across Europe to go to the polls for European parliament elections, as voters across Britain cast their ballots on Thursday in a contest many expected would no longer concern them.