Sophie Raworth (in-universe)

Sophie Raworth reported on the Year of the Slow Invasion. (TV: The Power of Three) At Christmas one year, she also reported on sightings of a police box in the sky. In truth, this was Santa Claus who had borrowed the Thirteenth Doctor's TARDIS as his sleigh had stopped working. (WC:  'Twas the Night Before Christmas)

Behind the scenes
Raworth played herself in The Power of Three and 'Twas the Night Before Christmas. She also featured in Mind My Minions.