I've just received this from a Canadian supplier through an Amazon order, and this is not aimed at their service (which was faultless).
However, it appears there are TWO versions of this film, the British one with the redubbed aliens having Scottish accents and heaps of sarcasm, and the US version. The version I received after ordering it from here however, does not have the redub, and the aliens have silly squeaky voices, and a subtitle translation.
As for my rating, the Scottish version would have gotten a 5, this one only deserves a 2.
While this is still watchable, and fairly funny, it's a pale shadow of the British release - if you're expecing an alien to complain about the stupid English or telling Roger of Journingham he's not getting a (censored) sausage, I'm afraid you're going to be disappointed.