Question: Odin's People was an Irish folk trio active in the 1960s, made up of Larry Johns, and the twins Elaine and Derek Thompson, a Northern Irish actor, most notable for playing Charlie Fairhead in which long-running BBC television medical drama series?

Context articles: Moloney, O'Connell &amp; Keane
Odin's People
Gillian Kearney
Exile (Casualty)
Characters of Casualty
Richard Winsor
Simon Williams (actor)
Doctors (series 1)
Derek Thompson (actor)
Charlie Fairhead

Moloney, O'Connell & Keane is an early 1980s folk trio of traditional Irish music made up of guitarist and singer-songwriter Robbie O'Connell, banjoist and singer Mick Moloney and piano accordion virtuoso Jimmy Keane.
 The trio released two critically acclaimed albums: "There Were Roses" in 1985 (including the first recording of the iconic Irish song "There Were Roses" that was penned by the famous Irish folk singer-songwriter Tommy Sands but recorded first by the trio and the album "Kilkelly" in 1987 including O'Connell's signature song "Killkelly".
Odin's People was an Irish folk trio active in the 1960s, made up of twins Elaine and Derek Thompson and Larry Johns.
 They released two singles on the Major Minor label in 1967.
Gillian Louise Kearney (born 9 May 1972, Liverpool, Merseyside) is an English actress best known for her early role as Debbie McGrath in Channel 4's Liverpool-based soap opera "Brookside" and the spin-off mini-series "Damon and Debbie", and for playing Jessica Harrison in the long-running BBC television medical drama series "Casualty", as well as Emma Barton in the ITV Yorkshire-based soap opera "Emmerdale".
"Exile" is the thirty-second episode of the twenty-ninth series of the British medical drama "Casualty".
 It was written by Kelly Jones, directed by Steve Hughes, and produced by Jonathan Phillips.
 "Exile" first aired on 16 May 2015 on BBC One in the United Kingdom.
 The plot sees Charlie Fairhead (Derek Thompson) and Connie Beauchamp (Amanda Mealing) travel to Bucharest to help Charlie's son Louis (Gregory Foreman), who has become a heroin addict and is planning on selling his kidney to pay his debts.
"Casualty" is a British medical drama television series that premiered on 6 September 1986 on BBC One.
 The series was created by Jeremy Brock and Paul Unwin.
 It is set in the fictional Holby City Hospital, in the equally fictitious city of Holby, and features occasional crossovers of characters and plots with spin-off show "Holby City".
 "Casualty" follows the professional and personal lives of the doctors, nurses, paramedics, hospital management and patients at Holby General.
 It features an ensemble cast of regular characters, and began with 10 main characters in its first series, all but two – Charlie Fairhead (played by Derek Thompson) and Lisa "Duffy" Duffin (played by Cathy Shipton) – have since left the show.
 Many main characters have been written in and out of the series since.
 In addition, "Casualty" features guest stars each week, as well as recurring guests that take part in story arcs that span a portion of a series or multiple series'.
Richard Winsor (born 4 January 1982) is a British actor and dancer.
 He is best known for his role as Caleb Knight in the long-running BBC television medical drama series "Casualty" from January 2014 until April 2017, when his character was killed off after being stabbed by a patient's relative.
Simon Williams (born 16 June 1946), is an English actor known for playing James Bellamy in the period drama "Upstairs, Downstairs".
 Frequently playing upper middle class or aristocratic upper class roles, he is also known for playing Dr. Charles Cartwright in the sitcom "Don't Wait Up" and Sir Charles Merrick in medical drama "Holby City".
 Since 2014, he has played the character of Justin Elliott in the long-running BBC Radio 4 series "The Archers".
Series one of the long-running BBC television medical soap opera "Doctors" first aired on 26 March 2000.
 The first series ran for 41 episodes.
 This series concluded on 19 May 2000.
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".
 Thompson has played the role since the series' inception in 1986.
Charlie Fairhead, played by Derek Thompson, is a fictional character from the BBC British medical drama "Casualty".
 He is the longest-serving character having played the role of Charlie for over 30 years and the only remaining original character to have appeared continuously since the first episode on 6 September 1986.
 Thompson chose to take a nine-month break from the show in early 2004.
 Charlie left the show in series 18 on 17 July 2004 and after five months, returned on 1 January 2005 in series 19.
 At the end of series 19, Charlie left again as Thompson returned to his break from the show, with Charlie's exit scenes airing on 20 August 2005.
 After four months off-screen, Charlie returned in the series 20 Christmas crossover with "Holby City", which aired on 24 December 2005.
 Thompson has remained with the show since, but regularly takes breaks of around two months every year.