Revenue stamps of Northern Ireland
Upon the partition of Ireland in 1921, separate revenue stamps began to be issued for both Northern Ireland and Southern Ireland. The latter were withdrawn soon afterwards upon the establishment of the Provisional Government, but the former continued to issue revenue stamps until the late 20th century. The need for separate issues for Northern Ireland came about since taxes raised there were meant to remain in the country. Most Northern Irish revenue stamps were British key types with appropriate inscriptions, but there were a number of different issues as well.
Northern Ireland Office
Before the partition, Ireland was governed through the Dublin Castle administration and the Home Office was also responsible for Irish affairs. From 1924 to 1972, Northern Ireland affairs were handled by the Northern Ireland Department of the Home Office. In August 1969, for example, Home Secretary James Callaghan approved the sending of British Army soldiers to Northern Ireland.