By 1912, when Deasy resigned because of his ill-health,[1] Siddeley had added his name to the Deasy product's radiator. In November 1912 Deasy's business became—by popular vote of the shareholders—Siddeley-Deasy. During World War I it grew rapidly producing aircraft engines and airframes with the assistance of distinguished staff from the Royal Aircraft Factory at Farnborough as well as motor vehicles including ambulances[2] using Rover chassis and Daimler and Aster engines and employed around 5,000 workers.[5] He was appointed a Commander of the Order of the British Empire in the 1918 New Year Honours for his industrial services during the war.[6]