The United Kingdom is a unitary state with a parliamentary constitutional monarchy, comprising four countries: [[England]], [[Scotland]], [[Wales]], and [[Northern Ireland]]. Following Brexit in 2020, it's no longer an [[European Union (EU)]] member but maintains a trade agreement with the EU. Its advanced economy, one of the world's largest, combines free-market principles with state regulation and welfare provisions. Key economic strengths include financial services (London being a global financial center), technology, pharmaceuticals, aerospace, and creative industries. The UK retains its own currency (pound sterling) and significant global influence through its financial sector, cultural exports, and international relationships, including Commonwealth leadership. Despite its strong economy and global influence, it faces challenges with regional economic disparities, productivity growth, and adapting to post-Brexit trade relationships.