The British Government consists of three main parts: the House of Lords, the House of Commons, and the Queen. The House of Lords has 675 members who play an important role in reviewing legislation. The House of Commons has 650 members who are elected by constituents to represent specific districts. It is the most powerful house. General elections are held every five years so the British people can select parties to form a government led by a Prime Minister to run the country, subject to approval by the Queen.