The Prime Meridian at Greenwich, London is the reference for every time zone in the world.
What is Greenwich Mean Time (GMT)?
United Kingdom is now on GMT
What are the geographical coordinates of United Kingdom?
Latitude of UK: 54º00´ North of the Equator
Longitude of UK: 2º00´ West of Greenwich
What is the official name of United Kingdom?
conventional long form: United Kingdom of Great Britain and Northern Ireland
conventional short form: United Kingdom
abbreviation: UK