BBC Auditions Room 33
From Tardis Wiki, the free Doctor Who reference
In Earth-33⅓, BBC Auditions Room 33 was the location within the BBC where the Cyberman auditions were held. The process involved auditionees queueing up and being shot at point-blank range. The auditions were directed by John Nathan-Turner and quietly observed from a distance by the Sixth Doctor and Melanie Bush. (COMIC: Doctor Who? 125)