Style: Rainbow flag creator combined fashion, politics.

The untold story of rainbow flag creator Gilbert Baker, the ‘gay Betsy Ross.’

LONDON — Thousands of Brexit protesters marched Saturday in London to demand a new referendum on leaving the European Union, as a divided Britain marked the second anniversary of its vote.

Leading Brexit supporters, meanwhile, warned the British government not to delay or water down the divorce from the 28-nation bloc. Foreign Secretary Boris Johnson said Prime Minister Theresa May must deliver the “full British Brexit” that voters were seeking.

Britain voted 52 to 48 percent on June 23, 2016, to leave the EU, and its official exit is slated for March 29, 2019. But the country — and its Conservative government — remain divided about what kind of economic relationship it wants with the EU.

Opponents of Brexit, many waving EU flags, marched through central London to Parliament on Saturday, calling for a referendum on whatever divorce deal is agreed between Britain and the EU. The People’s Vote campaign argues that public opinion is turning against Brexit as the economic costs become clearer.

The government is determined to see Brexit through, but May’s Cabinet is split over how to proceed, with Brexit-backing ministers such as Johnson calling for a clean break so that Britain can strike new trade deals around the world. Others, including Treasury chief Philip Hammond, want to keep closely aligned to the bloc, Britain’s biggest trading partner.

Amid the uncertainty, EU leaders are growing frustrated with what they see as a lack of firm proposals from the United Kingdom about future relations.

Many businesses warn that a failure to reach a free-trade agreement between Britain and the EU would be disastrous.

Niklas Halle’n / AFP / Getty Images European Union supporters gather in central London for a march demanding a referendum on the final Brexit deal.