Political leaders on both sides of the debate in Britain over whether to leave the European Union are now saying distinctly different things about some central issues than what they said before the referendum. Here are some examples.

When to begin the process

BEFORE Prime Minister David Cameron, who led the “Remain” campaign, said that if the country voted to leave, he would begin the formal process of leaving the union immediately by sending what is called an Article 50 notification to Brussels. He also said he would try to remain as prime minister.

AFTER The morning after the referendum, Mr. Cameron said he would resign once a successor could be chosen and would leave it to his successor to issue the notification.

A promised £350 million a week

BEFORE The “Leave” campaign promised that Britain would be able to save 350 million pounds a week, or about $462 million as of Monday, that could be spent on the National Health Service, schools and housing. A slogan on the Leave campaign bus went further, promising explicitly to use that money to “fund our N.H.S. instead.” (The savings figure was widely disputed by economists, Remain campaigners and the Office for National Statistics.)