who did not return included Trent Whiddon, Iveta Lukosiute and Joanne Clifton. Clifton would remain involved in group dances and would feature on Strictly Come Dancing: It Takes Two as a dance expert. Robin Windsor, absent from the previous series because of injury, also did not return for this series. Three new professional dancers were introduced: Russian dancer Gleb Savchenko (from the American, Australian and Russian versions of Dancing with the Stars), South African dancer Oti Mabuse (from Germany's Let's Dance) and Italian dancer Giovanni Pernice. On 3 October 2015, the judges performed The Strictly, a signature dance made up of some iconic moves from the show's history for fans to do at home when they hear the theme tune; subsequently, a tutorial for the dance was made available on the show's website and iPlayer hosted by Natalie Lowe and Tristan MacManus. Series 13 was the last to feature Tristan MacManus, Kristina Rihanoff, Ola Jordan, Gleb Savchenko and Aliona Vilani as professional dancers. Jordan later announced that she had quit the show, claiming that the results were "fixed". Vilani announced three days after winning that she was leaving the show; however, she participated in the 2016 live tour. Savchenko announced that he was leaving the show on 28 June 2016. Series 14 (2016) Strictly Come Dancing returned for its fourteenth series with a launch show on 3 September 2016 on BBC One. This was Len Goodman's final series as head judge. On 28 June 2016, the list of professionals who were returning for the fourteenth series was revealed. Professionals from the last series who would not return included the previous series' champion and two-time professional winner of the show Aliona Vilani, former professional winner Ola Jordan and two-time professional finalist Kristina Rihanoff, as well as Gleb Savchenko and Tristan MacManus. Joanne Clifton returned after a one-series hiatus. The leaving professionals were replaced by Katya Jones, Burn the Floor dancer Gorka Márquez and former Dancing with the Stars US troupe member Oksana Platero. On 26 July 2016, three more new professional dancers — AJ Pritchard, Chloe Hewitt and Neil Jones, husband of new dancer Katya — were announced. Hewitt and Neil Jones did not partner a celebrity as the professionals outnumbered the celebrities, although they were still in group dances and appeared on It Takes Two. Series 15 (2017) On 4 May 2017, it was announced that series 7 finalist Natalie