Tony Livesey and Anna Foster review day one of the General Election campaign along with our chief political correspondent John Pienaar and our correspondents on the campaign trail. David Cameron had an audience with the Queen at Buckingham Palace to confirm the dissolution of parliament, before heading out on the road...Ed Miliband's focus was business and he attacked the Conservative's pledge to hold a referendum on Europe...for the Lib Dems, Nick Clegg insisted his "plucky party" can defy the polls, while Nigel Farage suggested UKIP has the potential to become one of the key players in British politics.