He looks the part, and acts the part, but sounds awfull. Yes i am accustomed to Crawford's voice in the role, but Callow is just very gruff and rough sounding, where as Fosco needs to have a softer side to be a true villian so he can attempt to seduce the audience aswell as Mariam. They also seem to be toning down the fat suit, he looked rather thin, pluss his fale nose looked really fake.
http://www.flickr.com/photos/27199361@N08/ Phantom at the Royal Empire Theatre