Ukip leader Nigel Farage believes Britain could follow the lead of Norway, which has access to the single market but is not bound by EU laws on areas such as agriculture, justice and home affairs. But others argue that an "amicable divorce" would not be possible.
"If Britain were to join the Norwegian club," says The Economist, "it would remain bound by virtually all EU regulations, including the working-time directive and almost everything dreamed up in Brussels in future." And it would no longer have any influence on what those regulations said.