William Ryan Lyle was the son of Alexander Mackenzie Lyle. William was born about 1851 in County Tyrone. William Ryan Lyle was the husband of Agnes Stewart Lyle. Major William Ryan Lyle was in the old Mid Ulster Artillery. The 1901 census lists William as age 48 living with his wife at house 29 in Donaghmore, Donaghmore, Tyrone. He is described as a Major in the Military Artillery and Wholesale Wine and Spirit Merchant. Major William Ryan Lyle died of wounds 22nd May 1918 wounds at The Grove, Hillingdon, London.
Hillingdon House Canadian Convalescent Hospital was opened in September 1915 and taken over by the Royal Flying Corps in 1917. During the Second World War, many of the hospitals in Middlesex, including those at Hillingdon and Uxbridge, became Military Station Hospitals and the Royal Air Force station at Uxbridge played a significant role throughout the war.