Despite a global investigation Megrahi’s conviction, and the failed appeals that followed, remain tainted- for some- by doubt and conspiracy theory. After almost four decades, a new Lockerbie trial. Abu Agila Masud is due to go on trial in August. He denies any involvement and says a video confession he made in 2011 was forced. Will the new trial finally put an end to it all?Myles Bonnar revisits relatives of the victims and investigators, as new evidence challenges long held beliefs.Lockerbie is produced by Caitlin Smith 
Additional production by Rob Wilson
Sound design by Eloise Whitmore
Story consultants are Innes Bowen, Jack Kibble White and Graham Russell
Fact checking by Faisal Qureshi
Research by Rachael O’Neill and Callum McCulloch-Nowlan
Original development by Sally Greig Lockwood
Executive Producer: Gillian Wheelan 
BBC Scotland commissioners: Heather Kane Darling and Victoria Easton-Riley 
For BBC Radio 4, the commissioning executive is Tracy Williams, and commissioning editor is Dan Clarke.
Music by Callan Marchetti

A 9/11 Story: Trailer

Twenty-five years on from the deadliest terror attack in history, BBC investigative journalist Jane McMullen asks why thousands of grieving families are still fighting for answers.  
 
In early 2000, two young Saudis arrived in San Diego. They had never been to America, spoke almost no English, and had no idea how to open a bank account or rent a flat. Within weeks they had done all of it. Twenty months later they hijacked a plane and crashed it into the Pentagon. 
 
McMullen investigates the hidden story of a man who helped two of the hijackers - and reveals a story that the US and Saudi governments have fought to keep secret.