Sinn Fein means "ourselves alone" in the Irish language and campaigns for Irish Nationalism. The party was founded in 1905 by Arthur Griffith. A number of Sinn Fein MPs have been elected to the House of Commons but have not taken their seats in the British Parliament.
Further information on this subject can be found from the following links.
Sinn Fein website
Current state of the parties
Political parties represented at Parliament
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