Lib Dems: guardians against political extremes?

Nick Clegg says the role of the Liberal Democrats is to stop the next government “lurching off to extremes”, as he launched the party’s manifesto.

Read more in the General Election 2015 live blog: http://news.channel4.com/election2015

Fracking: the debate

Chris Faulkner, chief executive of the Breitling Energy Corporation and Ewa Jasiewicz from Fuel Policy Action debate fracking.