In 1934, Wood was commissioned as a 2nd Lieutenant into the Royal Horse Guards. Like his father, in 1937 he entered politics as a Conservative, becoming Member of Parliament for the City of York. In 1939, at the outbreak of the Second World War, he rejoined the Royal Horse Guards and served for three years in the Middle East, continuing as a member of parliament during this time. At the 1945 general election, he lost his seat to the Labour candidate, John Corlett.
Wood was styled Lord Irwin between 1944 and 1959, when he succeeded his father as Earl of Halifax and joined the House of Lords. He was a Deputy Lieutenant of the East Riding in Yorkshire between 1955 and 1968, and Lord-Lieutenant of Humberside between 1974 and 1980. He was also High Steward of York Minster between 1972 until 1980.
Lady Caroline Victoria Wood (born 10 September 1937, died 15 November 2014), married, firstly, Randle J. Feilden in 1958 (divorced in 1970), secondly, John V. Gosling in 1970.[5]
Virginia Mary Feilden (born 6 June 1959, died 24 March 1994)
Randle Charles Roderick Feilden (born 19 January 1961)
Fiona Caroline Feilden (born 26 January 1965)
Lady Susan Diana Wood (born 22 September 1938), married Brigadier Ian Darsie Watson in 1959.