Which political entity holds authority over UK-wide matters as opposed to local matters in Northern Ireland?

The UK Parliament holds authority over matters that affect the entire United Kingdom, including legislation on issues such as foreign policy, defense, and immigration. This centralized authority contrasts with the powers of local governance in Northern Ireland, which are vested in the Northern Ireland Assembly and the Northern Ireland Executive. The Assembly and Executive handle devolved issues such as health, education, and local policing, focusing on regional interests.

In contrast, while the European Parliament plays a role in shaping certain regulations and laws applicable to member states, its influence over direct UK governance ceased following Brexit. Therefore, it does not hold authority over UK-wide matters. Similarly, the Northern Ireland Assembly and the Executive are specifically designed for local governance and do not extend their authority to overarching UK issues.