Skylark Building Services was a construction company that operated in Sheffield in the early 21st century. It employed Karl Wright as a crane operator and Dennis as a security guard, and was owned by Wright's father.
In September, 2018, the Stenza warrior Tzim-Sha hunted Karl, who was operating a crane on a construction site late at night. Tzim-Sha climbed up Wright's crane, but was thwarted by the newly-regenerated Thirteenth Doctor, along with Ryan Sinclair, Yasmin Khan, Grace, and Graham O'Brien. In the process of stopping Tzim-Sha, Grace died after falling off a crane at the site. (TV: The Woman Who Fell to Earth)