What's happening

Today David Cameron is on a two-day visit to Japan, where he will meet with Japanese prime minister Yoshihiko Noda

Today Public and Commercial Services Union members who work for Department for Work and Pensions contractor Balfour Beatty walk out in protest at 300 compulsory redundancies of staff on minimum terms

9.45 Lib Dem candidates for Mayor and Deputy Mayor of London, Brian Paddick and Caroline Pidgeon, launch their party's manifesto for the 3 May elections

11.30 Mayor of London Boris Johnson officially launches his campaign for the 3 May mayoral election

18.00 Occupy London holds an open day for people to understand how they can get involved in the movement at the Friends Meeting House on Euston Road, London

What's been said

Despite reaching a comfy consensus, we haven't had any real debate on the issue of elected mayors, says John Harris in The Guardian

Do other cities risk getting caught up in Ken v Boris-style personality mayoral elections, asks Rachel Syvelster in The Times (£)

For democracy's sake we must oppose an elected House of Lords, says Phillip Blond in The Independent

It is dangerous to blur the line between judges and politicians, says Mary Riddell in the Daily Telegraph