A century ago, in the aftermath of the First World War, Britain established vast war cemeteries to honour each individual who died serving the nation. The Commonwealth War Graves Commission set up to run them became famous for its principle of equality in death for everyone, regardless of the military rank or their role in civilian life. David Lammy journeys across Kenya and Tanzania to find out why many African soldiers and porters were overlooked during the conflict, and their names forgotten. He also looks at the impact this has on modern Africa and its communities today, and why he believes Britain has to put this right.