CIA World Factbook: United Kingdom - Summary information about the country's geography, people, government, economy, communications, transportation, military and transnational issues. Includes a map.
Information of UK - History, government, weather, politics, education, employment, and music.
UK Discovered.com - Information for newcomers to the UK, including advice on finding flats and jobs, plus a forum and other information.
US Department of State - United Kingdom - Country portal offers a map and links to Background Notes, the US embassy and the current ambassador, press releases, fact sheets, annual Human Rights Reports and other major reports including Industry Market Reports.
Wikipedia - United Kingdom - Hyperlinked encyclopaedia article covers the country's history, government and politics, geography, economy, demographics, language and culture.