Ed Miliband has warned that Tory plans to hold a referendum on Britain's membership with the European Union pose a "clear and present danger" to jobs and prosperity.
The Labour leader will use the first day of the official campaign period to warn that David Cameron's plans for a referendum in 2017 will lead to "two years of uncertainty".
In a speech at Bloomberg in London today, Mr Miliband will say businesses will face years of "chaos" and will be left unable to plan for the future if the the Tories win power on May 7 and the referendum goes ahead.
Miliband will say that his party will not "condemn this country to years of uncertainty, years of insecurity, by threatening our European future".
ITV News UK Editor Rohit Kachroo has been with Nigel Farage as the Ukip leader plans his strategy for the ITV Leaders' Debate on Thursday.
It was, in some ways, a unique election launch, but how it will end is anyone's guess.
And we’re off! All aboard the big-blue-battle-bus, union flag fluttering and a typically dry election slogan stretching across the side.