Revenue stamps of the United Kingdom
When Ireland was partitioned into Northern Ireland and Southern Ireland in 1921, separate revenue stamps were issued for both entities. Southern Ireland stamps saw little use since that political entity was quickly superseded by the Provisional Government of Ireland and later the Irish Free State (both of which applied overprints on various British and Irish revenue stamps). However, Northern Ireland continued to use separate revenue stamps until the 1980s. Northern Irish revenues include Civil Service, Dog Licence, Excise and National Insurance stamps, among many others.
Devolution in the United Kingdom
The Northern Ireland Parliament was abolished by the Northern Ireland Constitution Act 1973, which received royal assent on 19 July 1973. A Northern Ireland Assembly was elected on 28 June 1973 and following the Sunningdale Agreement, a power-sharing Northern Ireland Executive was formed on 1 January 1974. This collapsed on 28 May 1974, due to the Ulster Workers' Council strike. The Troubles continued.