Feet First Sound was the studio which provided the foley for the Thirteenth Doctor reveal, Meet the Thirteenth Doctor.
Barnaby Smyth served as foley artist, and Keith Partridge as foley engineer.[1]
Specifically, they contributed Jodie Whittaker's footsteps in the dirt, and the sound of a breaking twig, and Sonorous Post worked on post-production sound to complete it.[1]