Thanks for that. I do have this boxset, but I'm on season 2 at the moment. I just looked on wikipedia and IMDb at the list of episodes and the air dates are different. There are loads of episodes on this boxset that are in the wrong order, not just the last few like you said. I am confused but at least I can watch all the episodes from season 3 in the correct order now.
I am going to do a quick review with the list of episodes in the correct order so I don't forget when I do eventually get to season three. Good job I noticed you mentioned it before I've watched it.