Wired UK:

To replicate with CGI, however, there had to be physical Daleks present. “Having the Daleks on set is quite an odd process because you rehearse the scenes with the operators standing in for the them but then when it comes to shooting, the poor guys are in there for about four or five hours at a time,” Wilson said. “You can just see the glow of iPhones through the head grills as they play games or read e-books. You also never know if there’s someone inside or not. So you’ll think you’re having a conversation with someone and suddenly another Dalek will respond. They do keep you on your toes.”

Great info about the making of the Doctor Who season premiere, “Asylum of the Daleks” (which made its debut last weekend). The episode featured many different Dalek models which producers had to beg and borrow from the BBC, exhibitions, collectors and fans – including former show-runner Russell T. Davies.