8.30am - Nick Clegg to address Lib Dem supporters/ party workers. Expected to say this is the "beginning of the end for Gordon Brown", claiming Brown is "directly and personally responsible for the biggest mistakes of the last 13 years". Expected to highlight the banking crash and recession, the "illegal invasion of Iraq", the "corruption and rottenness in our politics" and claim Britain has become more unequal and unfair under Labour.
9.00am - Last Cabinet meeting
10am - Gordon Brown departs for an audience with the Queen
10.30am - David Cameron to address Tory supporters. Theme is expected to be: "We're fighting this election for the Great Ignored - young, old, rich, poor, black, white, gay, straight.
"They start businesses, operate factories, teach our children, clean the streets, grow our food and keep us healthy - keep us safe. They work hard, pay their taxes, obey the law".
11am - Gordon Brown to formally announce date of election at Downing Street. He is expected to dub the election "the big choice". Expected to outline "three big challenges" facing the country: (i) Securing the recovery, (ii) protecting front line services whilst halving the deficit, and (iii) renewing politics.