Claudia Winkleman (in-universe)

Claudia Winkleman was a presenter. She once attempted to seduce the Eleventh Doctor. She did so unsuccessfully. (NOTVALID: Comic Relief 2013) She also attended Sprout Boy's Christmas party and met the Twelfth Doctor. (NOTVALID: Sprout Boy meets a Galaxy of Stars)

Behind the scenes
Her half-sister is Sophie Winkleman, who played Kelly Westwood in the Big Finish audio stories The Eight Truths and Worldwide Web.