In the Conservative-Liberal Democrat Coalition of May 2010, Luff was appointed as a junior Defence minister at the Ministry of Defence, with the post of Minister for Defence Equipment, Support and Technology. Prior to the general election of 2015, Luff had stood down as a candidate. He was knighted in the 2014 New Year Honours for political and public service. He joined the National Heritage Memorial Fund and the National Lottery Heritage Fund as Chair of the Board of Trustees on 30 March 2015. He married Julia Jenks in 1982. They have a son and a daughter.