UK terror threat raised to 'critical'

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Theresa May announces the threat of terrorism in the UK is now 'critical' - meaning that an attack is likely - following the botched attack on London Underground this morning. Also on the programme: besides sanctions and military threats, is there another way to de-escalate the North Korea problem? And why has global hunger started rising after a steady decline for over a decade? And finding the joy in lost archaic language with logophile Robert Macfarlane. Picture: A woman injured at Parsons Green station in London. Credit: PA.