Tasha Williams

Tasha Williams (WC: Case File - Stacey Facade) was a member of P.R.o.B.e. At the age of seven, she lost her mother to a disease, after which she was effectively raised by babysitters and nannies due to her father's obsession with his career. (PROSE: The Door We Forgot)

Giles suspected Tasha had something to do with Sir Andrew letting him withdraw his notice after Stacey Facade turned out to be an alien who seduced him. (WC: Case File - Stacey Facade)