He made the remarks yesterday when addressing a special session during the ongoing World Economic Forum summit in Swiss ski resort of Davos, a news agency reported.

Cameron outlined four key areas where he needs to see progress in Brussels in order to deliver on the concerns of the British people. The first area concerns Europe's economic competitiveness.

Although he confessed that he found the single market of 500 million people 'an absolutely thrilling prospect', the EU lags behind the US in technology and productivity.

Second, Cameron called for fair rules for countries that are not part of the Eurozone.

Third is the sovereignty issue. He said Britain has "never been happy with the idea that we're part of an ever-closer political union -- we're a proud and independent country."

Fourth are the twin issues of migration and welfare. He noted that the pressures from migration into the UK had become too great.

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