Just wanted to second the reviewer who bought from the french amazon site. I've done the same thing and it is series 6 with all the normal voices and works on region 2 players. Amazon.fr is very easy to use, i just signed in using my usual amazon.co.uk sign on and the dvd arrived in less than 5 days, so i finally get to find out what happens!
This is one of the best comedies i have ever seen. Unfortunately its meant to be a frightening horror film. I wouldnt bother buying it but should it come on TV again a it did on channel five yesterday I reccommend it for anyone needing cheering up or with two hours to spare.