Hi, thanks for your comments, and don't worry the more criticism the better!
I agree it has improved and the comments here have really helped me to do that so thanks very much all.
I'll have to think over the idea of moving the lasers next door etc. I still think the reason they keep the house should be based on their characters (i.e. Karen is worried about Timmy and Andrew wants to drink) rather than it being something about the house (it being detached, etc). I pre-empted you by taking out the part after the teachers licking the children 
I just got attached to the line "fists for eyes". Might use if elsewhere.
I do think the end with "the lasers..." etc could be tidied up. I was having trouble with that yesterday. But I wanted Andrew to be weakly trying to be reasonable right up until the end.
And I do like Andrew losing an arm....2525 probably won't though, don't know. It might be a case of us having different sense of humour as well because the 'cracking' bit at the start was just to get a joke right in, I'm not that keen on it. 