Boris Johnson upped the pressure on David Cameron yesterday by demanding he negotiate a far looser relationship with Europe and hold a referendum on the new deal.
The London mayor said Britain should exploit the eurozone crisis to free itself from key areas of the EU, including fisheries and social policy and farm subsidies.
Johnson also risked angering Downing Street by pre-empting a long-awaited speech by the prime minister on the issue and criticising his support for closer eurozone integration.
Cameron has hinted that he is ready to promise a referendum.
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