Question: Strictly Come Dancing returned for its tenth series, and began with the launch show on 15 September 2012, the judging panel by series 7 guest judge Darcey Bussell, who replaced another judge, Bussell is a retired English ballerina, and is currently one of the four judges, on which organization reality show "Strictly Come Dancing"?

full_context: Document 1: Strictly Come Dancing: Strictly Come Dancing (informally known as Strictly) is a British television dance contest, featuring contestants, celebrities, and other people, from all walks of life, with professional dance partners competing in a ballroom and Latin dance competition. Each couple is scored out of 10 by a panel of judges. The title of the show suggests a continuation of the long-running series "Come Dancing", with an allusion to the film "Strictly Ballroom". The format has been exported to over 40 other countries, and has also inspired a modern dance-themed spin-off "Strictly Dance Fever". The show is currently presented by Tess Daly and Claudia Winkleman.
Document 2: Strictly Come Dancing (series 12): Strictly Come Dancing returned for its twelfth series beginning from 7 September 2014 with a launch show, with the live shows starting on 26 and 27 September. Tess Daly returned to present the main show on BBC One alongside Claudia Winkleman, who has been promoted to co-presenter in addition to the results show after Bruce Forsyth decided to leave the show after the eleventh series; however, Forsyth will continue to host the Christmas and Children in Need specials. Zoë Ball returned as presenter of spin-off show "" on BBC Two. Judges Len Goodman, Bruno Tonioli, Craig Revel Horwood and Darcey Bussell also returned.
Document 3: Strictly Come Dancing (series 7): Strictly Come Dancing returned for its seventh series on 18 September 2009 on BBC One. Bruce Forsyth and Tess Daly returned as presenters of the main show on BBC One, whilst Claudia Winkleman presented spin-off show "" on BBC Two. Len Goodman, Bruno Tonioli and Craig Revel Horwood returned as judges. Series 5 winner Alesha Dixon joined the judging panel as a replacement for Arlene Phillips. Darcey Bussell was a guest judge from the quarter final onwards.
Document 4: Margot Fonteyn: Dame Margot Fonteyn de Arias, DBE (18 May 191921 February 1991), was an English ballerina. She spent her entire career as a dancer with the Royal Ballet, eventually being appointed "Prima Ballerina Assoluta" of the company by Queen Elizabeth II.
Document 5: Dianne Buswell: Dianne Buswell (born 1989) is an Australian ballroom dancer. She has appeared on "So You Think You Can Dance Australia" and was a professional dancer on the Australian version of "Dancing with the Stars" in 2015. Buswell became a professional dancer on "Strictly Come Dancing" beginning in 2017.
Document 6: Strictly Come Dancing (series 10): Strictly Come Dancing returned for its tenth series and began with the launch show on 15 September 2012. The live shows commenced on 5 October. Fourteen celebrities took part - the same number as the previous year. Bruce Forsyth and Tess Daly returned to present the main show on BBC One and Claudia Winkleman returned to present the results show with Daly. Zoë Ball returned to present spin-off show "". Judges Len Goodman, Bruno Tonioli and Craig Revel Horwood all returned and were joined on the judging panel by series 7 guest judge Darcey Bussell, who replaced Alesha Dixon.
Document 7: Len Goodman: Leonard Gordon Goodman (born 25 April 1944) is an English professional ballroom dancer, dance judge, and coach.
Document 8: Strictly Come Dancing (series 15): Strictly Come Dancing returned for its fifteenth series with a launch show on 9 September on BBC One, with the live shows starting on 23 September 2017. Tess Daly and Claudia Winkleman returned as hosts, while Zoë Ball returned to host "" on BBC Two. Bruno Tonioli, Craig Revel Horwood, and Darcey Bussell returned as judges. On 9 May 2017, it was announced that Len Goodman would be replaced by Shirley Ballas due to Goodman's retirement from the show. This is the first series to have 2 female and 2 male judges on the panel.
Document 9: Darcey Bussell: Darcey Andrea Bussell CBE (born Marnie Mercedes Darcey Pemberton Crittle 27 April 1969) is a retired English ballerina, and is currently one of the four judges on the BBC reality show "Strictly Come Dancing".
Document 10: The Strictly: The Strictly is a signature dance routine from the BBC show "Strictly Come Dancing", which launched in the 13th series of the popular entertainment show. The dance was devised by "Strictly Come Dancing"'s Director of Choreography, Jason Gilkison and draws inspiration from some of the show's most iconic moves, as well as celebrating some of the show's stars.
Document 11: Strictly Come Dancing (series 11): Strictly Come Dancing returned for its eleventh series beginning with a launch show on 7 September 2013, with the live shows starting on 27 and 28 September 2013. Bruce Forsyth and Tess Daly continued to co-present the main show on BBC One, with Claudia Winkleman returning to present the results show alongside Daly. Zoë Ball returned as presenter of "" on BBC Two. Len Goodman, Bruno Tonioli, Craig Revel Horwood and Darcey Bussell also returned as judges.
Document 12: Strictly Come Dancing (series 14): Strictly Come Dancing returned for its fourteenth series with a launch show on 3 September on BBC One, with the live shows starting on 23 September 2016. Tess Daly and Claudia Winkleman returned as hosts, while Zoë Ball returned to host "" on BBC Two. Len Goodman, Bruno Tonioli, Craig Revel Horwood and Darcey Bussell returned as judges. This was Goodman's final series as a judge.
Document 13: Strictly Come Dancing (series 13): Strictly Come Dancing returned for its thirteenth series on BBC One with a launch show on 5 September 2015, with the live shows starting on 25 September 2015. Tess Daly and Claudia Winkleman returned to present the launch show and the live shows while Zoë Ball returned to present "" on BBC Two. Len Goodman, Bruno Tonioli and Craig Revel Horwood returned as judges for their thirteenth series, along with Darcey Bussell who returned for her fourth series as a judge.
Document 14: Anton du Beke: Anthony Paul Beke (born 20 July 1966), known professionally as Anton du Beke, is a British ballroom dancer and television presenter, best known as a professional dancer on the BBC One celebrity dancing show "Strictly Come Dancing" since the show began in 2004. In 2009, he presented the UK version of "Hole in the Wall", for the BBC, replacing Dale Winton after being a team captain in 2008.
Document 15: English National Ballet: English National Ballet is a classical ballet company founded by Dame Alicia Markova and Sir Anton Dolin and based at Markova House in South Kensington, London, England. Along with The Royal Ballet, Birmingham Royal Ballet and Scottish Ballet, it is one of the four major ballet companies in Great Britain. English National Ballet is one of the foremost touring companies in Europe, performing in theatres throughout the UK as well as conducting international tours and performing at special events. The Company employs approximately 67 dancers and a symphony orchestra, (English National Ballet Philharmonic) and there is also an associate school, English National Ballet School, which is independent from the ballet company. The Company regularly performs seasons at the London Coliseum and has been noted for specially staged performances at the Royal Albert Hall. In 2014 English National Ballet became an Associate Company of Sadler's Wells. The Patron of English National Ballet is HRH The Duke of York.
ground_truth: BBC