Who voice acted Philip in Overture ?

[Petike]

Well, I read the Credits of all three Penumbra games, and I still couldn't find out, who did Philip's voice acting in Overture. I know that in the tech demo, it was Mike Hillard, the one who played Red in Overture (BTW, brilliant voice acting). But Philip was obviously dubbed by some other, younger sounding fellow, who had a typical British accent (which fit well with the background of the protagonist). I couldn't find this other fellow anywhere in the voice acting credits. It wasn't Mike for sure. So, who was he ? Jens or Thomas faking a british accent ? :-D Please answer this little mystery to me... :-) I am really curious about it.