Mr. Patel and Yemi both appear in an episode of Doctor Who (S4E11 and S9E12 respectively), as well as Razer who is a full time companion from series 11.
In reference to Malachi Kirby's character Yemi, another character declares "He could be Kunta Kinte for all I care." Kirby would go on to play Kinte in the 2016 version of "Roots".