There are many local clans within Tir Nan Beo. These clans are not open for players. Brief information can be found in the crew section.
There are many clans within Dumnonni. Dumnonni UK players can come with their own player character. As this is part of Dumnonni it means that the time lines do continue. If you die heroric in Tir Nan Beo then your character is truly death in Dumnonni.
About the Dumnonni UK clans and some special characters, please go to the Dumnonni website (http://www.dumnonni.com). Some of the famous clans are (in alphabetical order):