Britain leaving the European Union could result in a permanent loss of 2.2 percent of the country's gross domestic product by 2030, and the costs would not be offset solely by striking a free trade deal with its former partners.
The prospect of Brexit - Britain breaking away from Brussels - has moved up the political agenda in tandem with a surge in support for anti-EU party UK Independence Party (UKIP) in recent years.
The Conservative Party, which has long contained a wing sceptical about the …
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