filmed, produced and directed by Marcel Mettelsiefen ; co-produced and edited by Stephen Ellis, A.C.E. ; senior producer, Dan Edge ; an ITN production for WGBH/Frontline in association with Channel 4 and ZDF
filmed and directed by James Bluemel ; filmed and directed by Abi Mowbray, Paul Glynn, Jack MacInnes, Sasha Achilli ; senior producer, Dan Edge ; producers, Itab Azzam, Matthew McDonnell ; a Keo Films Ltd. production for WGBH/Frontline and BBC