Kate Adie presents stories from Iran, Norway, France, Ireland and Switzerland.

A recent marathon race in Iran caused controversy after many of the 2000 women runners ignored the country's mandatory hijab law, and ran without a head covering. Years after deadly protests rocked the country, Faranak Amidi charts how women in Iran today are continuing to defy the religious authorities on a daily basis.

Svalbard in the Arctic Ocean is home to an array of wildlife, including Polar Bears. With their survival under threat, Beth Timmins considers their future - and past - while sailing off the bay of Skansbukta.

The French have a penchant for chestnuts, and demand in the country often vastly outstrips supply. And in the chestnut groves of the Cévennes, intensifying droughts are pushing the crop to the brink. Julius Purcell met chestnut farmers keeping a centuries-old culture alive, in the face of a warming planet.

Irish pubs may be one of the Emerald Isle’s most ubiquitous exports, but Irish whiskey has dipped in popularity over the last century in part due to politics - but also increased competition. Jordan Dunbar has been following the fate of his homeland’s much-loved liquor, ever since a surprise encounter in Japan.

And finally, Switzerland is famously neutral - but what that neutrality means is a subject that preoccupies the Swiss. Everyone knows that the Swiss banked Germany's money during the second world war, but a new exhibition shows how cooperative Switzerland also was to the allies. Imogen Foulkes reports from Geneva.

Series Producer: Serena Tarling