Got this script off a Halloween website - it's solely credited to Wallace although my understanding was that it came from a story by John Carpenter and Nigel Kneale did some study on it. It's an interesting attempt to do something different - an entirely new tale in the Halloween universe, this being a story about an evil Irish manufacturer who wants to kill a whole lot of people on Halloween.
It's clearer here that Challis is separated from his wife, though he's still a dick. The stuff about Connor making a fortune from fake poop feels silly and often you get the impression scenes and moments are just there for shock without really making sense. Really it probably should have been an anthology TV show. But it's nice and creepy with a memorable ending.