The Leave campaign must choose. It cannot safeguard access to the EU single market and offer a plausible arrangement for the British economy, unless it capitulates on the free movement of EU citizens.

One or other must give. If Brexiteers wish to win over the cautious middle of British politics, they must make a better case that our trade is safe. This means accepting the Norwegian option of the European Economic Area (EEA) - a 'soft exit' - as a half-way house until the new order is established.

It means accepting the four freedoms of goods, services, capital, and labour that go with the EU single market. It means swallowing EU rules, and much of the EU Acquis, and it means paying into the EU budget.

Leavers know that if they gave in to these terms, they would drive away all those other voters who want to slam the door on immigration. So the campaign has been evasive, hoping to muddle through until June 23 with the broadest possible church.