[3] He was elected to Belfast City Council for the group in 1958,[4] topping the poll.
[5] He left the group before the next elections, in 1961, joining the Ulster Unionist Party (UUP).
[6] Cullough secured re-election under his new party colours and, by 1965, he was the chair of its Improvement Committee.
[8] He resigned from the UUP in September 1970,[9] and became a founder member of the Democratic Unionist Party (DUP) the following year.
[10] The Senate ceased to meet in 1972,[8] and, although McCullough remained a supporter of the DUP, he did not stand in any further elections.