Constitutional Organizations, Institutions, and Roles

For information on Parliament see:
http://www.parliament.uk/

For information on the UK Government see:
http://www.direct.gov.uk/

For information from the UK Prime Minister’s Office see:
http://www.number10.gov.uk/

For information on HM Courts’ Service is:
http://www.hmcourts-service.gov.uk/

The UK Supreme Court website is available at:
http://www.supremecourt.uk/

For details of the Judicial Committee of the Privy Council, see:
https://www.jcpc.uk/

For information on the monarch and the monarchy, see:
http://www.royal.gov.uk/

Many of the constitutional institutions may be followed on Twitter, too:

Parliament:
http://twitter.com/ukparliament

Prime Minister's Office:
http://twitter.com/DowningStreet

Monarchy:
http://twitter.com/BritishMonarchy