This World - Season 14 / Year 2017

Around the world there has been a huge increase in the number of children being referred to gender clinics - boys saying they want to be girls and vice versa. Increasingly, parents are encouraged to adopt a 'gender affirmative' approach - fully supporting their children's change of identity. But is this approach right?

In this challenging documentary, BBC Two's award-winning This World strand travels to Canada, where one of the world's leading experts in childhood gender dysphoria (the condition where children are unhappy with their biological sex) lost his job for challenging the new orthodoxy that children know best. Speaking on TV for the first time since his clinic was closed, Dr Kenneth Zucker believes he is a victim of the politicisation of transgender issues. The film presents evidence that most children with gender dysphoria eventually overcome the feelings without transitioning and questions the science behind the idea that a boy could somehow be born with a 'female brain' or vice versa. It also features 'Lou' - who was born female and had a double mastectomy as part of transitioning to a man. She now says it is a decision that 'haunts' her and feels that her gender dysphoria should have been treated as a mental health issue.

This documentary examines Zucker's methods, but it also includes significant contributions from his critics and supporters of gender affirmation, including transgender activists in Canada and leading medical experts as well as parents with differing experiences of gender dysphoria and gender reassignment.

The European Union faces the biggest challenge in its 60-year history, with the rise of populist eurosceptic movements across the continent. As Britain prepares to begin the process of withdrawing from the EU, the BBC's Europe editor Katya Adler asks whether the Union itself can survive.

At the 2016 European Championships, violent clashes between Russian and English supporters in Marseille put the spotlight on Russian hooliganism. Russian hooligans injured over 100 English supporters, beating two into a coma, and it raised serious concerns ahead of Russia hosting the 2018 World Cup.

In Born Too White, NHS doctor Oscar Duke (24 Hours in A&E), who himself has albinism, embarks on a personal journey to discover what life is like for people who share his condition in these countries.

With a mass-casualty terror attack in the UK seen as almost inevitable, this drama documentary dramatises what terrorism experts fear is the most likely scenario for Britain's next major terror attack. Counterterrorism police believe that the greatest threat to our security comes from Marauding Terrorist Firearms Attacks (MTFA), which can result in dozens of fatalities even if armed police respond within minutes. There are more than a thousand high-priority terrorism suspects in the UK, but there are only enough surveillance officers to monitor a fraction of these at any time.

Based on extensive research, The Attack: Terror in the UK tells the story of an Islamic State-inspired terrorist group planning a firearms attack and follows the ongoing police investigation. It focuses on Joseph, a young man who, while in prison for drug and firearms charges, is recruited, converted and radicalised by Islamic extremists - highlighting the fear that links are being forged between jihadists and street gangs with access to automatic weapons.

Adventurer and journalist Simon Reeve heads to one of the most spectacular countries in the world - Colombia. For 50 years, Colombia has been in the grip of a brutal civil war that has killed more than 200,000 people and displaced seven million. But in late 2016, a peace deal was signed promising to end the conflict and finally bring peace to the country.

In this hour-long documentary for the award-winning This World strand, Simon explores Colombia at a pivotal point in its history. He travels into the jungle and comes face to face with the guerrilla army FARC, which is now promising to lay down arms. In the Pacific coast city of Buenaventura, Simon finds out more about the fearsome right-wing paramilitary gangs who now dominate the cocaine trade. As the FARC abandon the countryside, there is a fear that these groups will only grow in power. Travelling in the countryside, Simon meets the coca farmers who are demanding government support to stop growing coca and stop the flow of money to criminal gangs. With land ownership, poverty and drugs at the heart of Colombia's problems, it is in the countryside that the country's precarious future will be decided.