In the United States, the White House has led the march towards open source and free software by switching the http://www.whitehouse.gov/ website to the Drupal content management system. The government of the United Kingdom has decided to follow their lead. http://data.gov.uk/ acts as a central information repository for many of the UK's government agencies. The government recently converted the site to a very clean and very polished Drupal website. The main effort of the site is to provide the British constituency with transparent access to data on the actions and statistics of various government bodies.
In keeping with the spirit of free and open source software, the government of the UK made some additions to Drupal. They have released these additions as free software to the development community.
rest here