What role is the twin of Elaine Thompson most notable for playing in the television series "Casualty"?  
Odin's People: Odin's People was an Irish folk trio active in the 1960s, made up of twins Elaine and Derek Thompson and Larry Johns. Derek Thompson (actor): Derek Thompson (born 4 April 1948) is a Northern Irish actor, most notable for playing Charlie Fairhead in the long-running BBC television medical drama series "Casualty".
Charlie Fairhead