He served with the Royal Tank Regiment after the Second World War and later joined the family car dealership.
An active member of the House of Lords, he served on the Select Committee on Science and Technology from 1980 to 1983.
He stepped down from the government after the 1987 general election, but continued to be active in the House of Lords.
Lord Lucas of Chilworth married, firstly, Ann Marie, daughter of Ronald William Buck, in 1955.
Lord Lucas of Chilworth died in November 2001, aged 75, and was succeeded in the barony by his eldest son Simon.