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At the core of the European Union must be, as it is now, the single market. Britain is at the heart of that Single Market, and must remain so.

"The Danger Is that Europe Will Fail". David Cameron Speech on the Future of Europe, www.spiegel.de. January 23, 2013.
At the core of the European Union must be, as it is now, the single market. Britain is at the heart of that Single Market, and must remain so.