There has been a parliament at Westminster since the 13th Century.
Today it remains the centre of British government, boasting a colourful history and frequently adding new chapters.
Parliament is the place where politicians meet to decide laws and make decisions on running the UK, although some issues in Scotland,Wales and Northern Ireland are now dealt with by their respective parliaments and assemblies.
Decisions on setting taxes to fund the government's policies are also made in Parliament.
The business of Parliament takes place in two "houses": the elected House of Commons and the House of Lords, whose members are mostly appointed.
Their work is similar: making laws (legislation), checking the work of the government (scrutiny), and debating current issues.
Generally, the decisions made in one house have to be approved by the other, but the Commons is by far the more powerful of the two chambers.
Parliamentary material is reproduced with the permission of the Controller of HMSO on behalf of Parliament.
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