On 2 November 2012 the Government announced that Armitt would be a member of the Airports Commission. He is a non executive director of the Berkeley Group and was a Transport for London board member from 2012 to 2016 The 'Armitt Review', an independent review of long-term UK infrastructure planning, was published in September 2013, and is Labour Party policy. He was appointed to the National Infrastructure Commission in 2015, became Deputy Chairman in 2017 and was appointed Chairman in 2018.