Cunningham remained on the backbenches, known as one to the right of Ulster Unionism and a friend of Ian Paisley, through the rest of the 1960s, he frequently clashed with Harold Wilson during this period, but decided to retire at the 1970 general election. He was Master of the Drapers Company in 1973–74. He was Provincial Grand Master of the Masonic Order in Gloucestershire from 1970-76. He was a member of the Apprentice Boys Club in Derry and attended the 275th Anniversary of the shutting of the gates. Throughout his life he represented the old landed interests of Ulster and remained personally wealthy through family inheritance. He died suddenly at Derhams House, Minchinhampton on 29 July 1976 at the age of sixty-seven.