I am going to wait for my letter tomorrow and see if that offers any insight. Then I am going to call Latrobe and say matter of factly, I have accepted your offer but I didn't do bio so when do I do my bridging course.
I agree with some of the other people that have posted, DON'T tell them anything unless you are uncomfortable doing the course without the require prerequisite. If you think you can manage it, the only possible responses you will get will be, "Oh... Ok then, don't worry about it" or "Ok a mistake has been made, I'm really sorry but I'm going to need to withdraw your offer," and somehow I think the latter is more likely. Fair enough, if you don't think you can handle the course without bio, give them a call and discuss your options but if you think you'll be fine then just sit back and thank your lucky stars that somebody made a mistake.
I got into Arts at Monash... A bit upset because I would have just missed out on Law with SEAS but I guess that's how it works. Crossing my fingers for second round or internal transfer after a year.