The political system in the United Kingdom is a liberal, multiparty, parliamentary democracy. There are three main parties represented in the Houses of Parliament, which comprises the House of Commons and the House of Lords. The Commons is formed of 650 elected MPs (Members of Parliament), each representing a constituency. The Lords is formed of peers, who are given peerages by appointment of the Prime Minister. Whilst the Lords are unelected, they are selected for specific expertise, for example, many top-ranking barristers are appointed. In both of these Houses, the Government is held to account in the form of debates and question times. The Government is formed of MPs and Lords from the majority party in the House of Commons (the party with the most MPs) and is headed by the Prime Minister. Click on a picture for more information.