Sheila Clark

Sheila Clark mysteriously dissapeared, on a Tuesday in the department store, Sanderson & Grainger. She was in fact taken by the Cybermen and converted. She was destroyed when Craig Owens foiled the Cybermen's attempt to convert him into a Cyber-Controller and overloaded their emotional inhibitors with "love". (DW: Closing Time)

She presumably worked at Sanderson & Grainger.