Ed Miliband, the Labour leader, spent the morning at engineering company David Brown Gear Systems in Huddersfield where he talked about his party's tax plans. He said it was time that the UK returned to being a country that properly "rewards hard work".
Mr Miliband was joined by Rachel Reeves, the Labour candidate for the Leeds West constituency.
Samantha Cameron at a school in Kent as she made her first solo appearance on the campaign trail. The prime minister's wife was throwing her support behind the Conservative candidate Kelly Tolhurst in Rochester and Strood, the seat lost to UKIP last autumn after Mark Reckless defected from the Tories.
Meanwhile, her husband was visiting Marston's brewery in Wolverhampton. David Cameron welcomed a letter signed by 100 business leaders and published in the Daily Telegraph that backed the coalition government's reductions in corporation tax since 2010.
Journalists in Glasgow questioned the Liberal Democrat leader Nick Clegg and Jo Swinson, the party's candidate for East Dunbartonshire, at a coffee shop.
After lunch, Mr Clegg and Ms Swinson met parents at a local playgroup, a good place to talk about the Lib Dem proposal to triple paternity leave to six weeks.
Boris Johnson, the Mayor of London and the Conservative parliamentary candidate for Uxbridge and South Ruislip, at the launch of his party's London election campaign in Mill Hill.
The DUP leader Peter Robinson said in Antrim that his party, Northern Ireland's largest with eight MPs in the last Parliament, had been discriminated against by broadcasters. "Three of the parties in the seven-leaders' debate are smaller parties than we will be before, during and after an election, and I just cannot see how the discrimination against this party and Northern Ireland can be justified."
The Labour shadow chancellor Ed Balls (left) with the Scottish Labour leader Jim Murphy at the Royal Concert Hall in Glasgow. Mr Balls said that in government the party would spend an extra £800m in Scotland on the NHS, education and job creation.
