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Monday 09 November 2015 10:26 am

Brexit referendum: Mayor of London Boris Johnson says without a deal the UK will leave the EU

By: James Nickerson

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Mayor of London Boris Johnson has warned that if the United Kingdom doesn't get a deal on treaty change it would vote to leave the European Union.

Writing in the Telegraph, Johnson said Prime Minister David Cameron is right to caution that he is prepared to support Britain leaving the European Union unless other European leaders agree to his reform agenda.

Read more: What will be Cameron's trickiest EU reform?

"Cameron is making it clear, in his long-awaited speech, that if he doesn’t get a satisfactory result in those negotiations, then he could lead the Out campaign; and in that great release of pent-up Eurosceptic energy there can be little doubt that he would be victorious," Johnson said.

Johnson added that our "friends and partners" need to understand that the UK is serious in its aims. He said:

The Prime Minister is rightly calling for reform that will give this country back control of its borders; that will stop the one-way ratchet towards ever closer union; that will curtail the profusion of regulation; that will stop the Eurozone countries from bullying those EU countries who do not use the euro and probably never will.

Johnson's article comes as Cameron appeared at the Confederation of British Industry annual conference, where he said the UK should be the most business-friendly country in Europe, and urged business and government to work together to ensure the UK is a leader of skills in Europe, not a follower. He also issued his warning, saying he does not want the status quo in Europe.

Read more: Morgan Stanley – Chance of Brexit is now one in three

While polls have become narrower as the In and Out campaigns made headwind, most Britons still remain in favour of staying in the EU.

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