The Investigatory Powers Bill promises to give the security services and police unprecedented powers to intercept private communications. Is it a price to pay for fighting terrorism or, as critics allege, “snoopers’ charter” Where does the balance between security and privacy lie? In conversation: Duncan Campbell is an award-winning investigative reporter; Dorothy-Grace Elder is a journalist and former MSP; Sir Malcolm Rifkind is a former chairman of the Intelligence and Security Committee of Parliament. Chaired by Nik Williams of Scottish PEN.