A million people have signed up to a scheme with the National Grid which rewards them with discounts if they reduce how much energy they use.Adam finds out how one customer has already saved £35 after signing up to the scheme and Newsnight’s economics editor Ben Chu explains how it works and why it was introduced.The BBC’s Home Affairs correspondent, June Kelly looks at the future of the probation service, after a report highlighted a catalogue of failings that left a serial offender free to murder Zara Aleena.Today's episode was presented by Adam Fleming and was made by Tim Walklate with Madeleine Drury and Chris Flynn. The technical producer was Emma Crowe. The assistant editor was Louisa Lewis.