So it's interesting to see the dissonance go in the opposite direction, from film to text. See, here's the TARDIS dematerialization sound:
I don't know about anyone else, but I certainly don't here anything in there that sounds like "vworp." It's certainly a difficult sound to render into text, but listening to it several times, I can't imagine translating it without some e's and probably a ch. "Vreeench" doesn't quite do it...maybe "vreeunnnnch."
1. This is, of course, excluding The Ten Doctors, which rocks my socks. I'm enjoying The Stalker of Norfolk too.