Think again? Calls mount for British to vote again on Brexit.

On a busy market square, Diane Holden stands by a whiteboard attached to a metal railing. “Brexitometer” it reads – a play on Brexit, the all-consuming national drama – above a row of columns.

Ms. Holden and her Brexitometer are part of a widening campaign to hold a second referendum on whether Britain should leave the European Union, which is what 52 percent of voters backed in a 2016 vote. Campaigners want another plebiscite on the Brexit deal, a do-over that could stop it in its tracks.

“How do you feel about the process?” she asks shoppers, competing with the throaty cries of fruit-and-vegetable sellers for their attention. “Do you think it’s going well?”

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