Darren Brunk is Humanitarian Coordinator for the New Zealand Council for International Development, the umbrella organisation for New Zealand NGOs that do aid work. He's just back from Istanbul where he attended the UN World Humanitarian Summit - set up by the secretary-general to help the 125 million people who are in need of humanitarian assistance. The summit was held near where thousands of Syrian refugees were being processed, and Darren talks about the successes - and failures of the event.