Nuclear fears in South Korea, a homeless tour of Athens, and a porcupine hunt in Tanzania. Kate Adie introduces correspondents’ stories from around the world.

Talk of war is worrying Steve Evans in the South Korean capital Seoul - he now fears for the future of his home city. In Italy, Nick Sturdee finds plain-clothes policemen following anti-migrant campaigners, while a TV drama is being filmed about the mayor opening up his town to Syrians, Bangladeshis and others. ‘Migrants wanted’ is the message Mark Stratton finds on Pitcairn Island – the British Overseas Territory with a dwindling population in the southern Pacific Ocean. Heidi Fuller-Love takes a tour of the Athens; guided by a former homeless drug addict, she’s introduced to sights of Greece most tourists are oblivious to. And in Tanzania, Dan Saladino joins one of the last remaining groups of hunter-gathers as they search for lunch.