Dubbed?

Are we sure Nigel Green is dubbed by Robert Rietty? He sounds the same as he does usually. Could this be an IMDB mistake? Or did Rietty just do an excellent job at imitating Green's voice.

And why then did they dub Nigel Green with a voice that sounded exactly like his own...was he ill? maybe?

"The face of evil is ugly to look upon. And as the pleasures increase, the face becomes uglier."