GETTY David Cameron believes quitting the EU would be 'political self-harm'

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The Prime Minister last night said leaving the single market would be "needless and reckless" in a furious attack on Eurosceptics. And he denied claims by London mayor Boris Johnson that Brexit would give "more freedom" to help the beleaguered British steel industry. His comments are likely to spark more accusations that Downing Street's "Project Fear" is scaring voters into voting 'In' on June 23.

Mr Cameron also dismissed the idea of a Canadian-style trade deal with the EU as an alternative to remaining in the 28-member bloc. He said: "If we take the Canada free trade deal as a guide, we know it would be damaging for agriculture and manufacturing. "Our beef and pork exports would face tariffs, and our car manufacturers forced to comply with rules imposing additional costs based on where they buy their components."

GETTY He dismissed the idea of a Canadian-style trade deal with the EU

More than half of our steel exports go to Europe David Cameron

Speaking to the Telegraph, the Prime Minister added: "And of course, there is British steel. "We are doing everything we can to help British steel in these difficult times. "But the idea that leaving Europe is the answer is a dangerous fallacy – more than half of our steel exports go to Europe."

GETTY Sir Lynton Cosby claims the pro-EU campaign has 'greater message discipline'