Thomas Gibson "Tommy" Henderson was an Ulster independent Unionist politician. He served in the House of Commons of Northern Ireland from 1925 to 1953 in vigorous opposition to the Unionist governments on all issues other than the partition of Ireland, and is famous for having at one stage spoken for nearly ten hours to outline his disagreements. Wikipedia*
On the C-SPAN Networks:
Tommy Henderson has one video in the C-SPAN Video Library; the first appearance was a 1998 Senate Committee.