In 2009, "Imperial Reckoning" served as the basis for an unprecedented legal claim filed by five Mau Mau detention camp survivors against the British government, and Elkins became the claimants' first expert witness before being joined by other historians in late 2010 and 2011. The case, known as "Mutua and Five Others versus the Foreign and Commonwealth Office (FCO)", was heard at the High Court of Justice in London with the Honourable Justice McCombe presiding. London human rights law firm Leigh Day and the Kenya Human Rights Commission (KHRC) in Nairobi were the claimants' legal representatives. During the course of legal discovery the FCO discovered some 300 boxes of previously undisclosed files that validated on a large scale Elkins' claims in "Imperial Reckoning" and provided thousands of pages of new evidence supporting the claimants' case of gross abuses perpetrated by colonial officials in the detention camps of Kenya in the 1950s. On June 6, 2013, the British government announced a settlement with the Mau Mau claimants, issuing its official apology of "sincere regret," a £20 million cash payment, and a monument to those tortured during the uprising, unveiled in Nairobi's Uhuru Park in 2015.