I was freaking out like that when I was moving to Uni for undergrad studies few years back, and since I was not from the UK I had no other choice but live in the halls and was putted in the worst ones my uni campus had...
First few weeks were quite ok, it was interesting and fun to experience all that true uni life, party all the time, drink all the time and etc, but after a month or so I got really bored with that. Others just wouldn't stop... And I actually went to uni to study so the constant noise from the kitchen and hallway (I lived right next to the kitchen and in my halls 24 people shared two kitchens but most of the time they all used that one next to my room) and before Christmas I moved out, I couldn't stand it any longer, coming to the bathroom (of course shared - for the whole floor (24 people) if I remember right 6 showers and 6 toilets) to see that one of the toilets has puke all over it, find broken kitchen door glass all over the kitchen floor, or flour all over the kitchen floor because hey it's fun to have a flour fight in the middle of the night (the halls were cleaned, but understandably the cleaner used to refuse to clean such things), others constantly stealing my food from the fridge, sink was always always alwaaays filled with dirty dishes... In the beginning I really thought it was going to be really fun living in halls with other students, have dinners together, plan parties, go out drinking and etc, but I also wanted to learn while all others obviously didn't care about that at all and drinking with loud music on (and terrible one too) took places on random nights, so it was impossible for me to sleep, study or live a normal life there...
So I moved out, around Christmas time but had to pay for the room till the end of the first year...
But of course, all that was not at Brookes but at other Uni, but still, if you're not interested in experiencing the whole uni life uni halls might not be for you. Though, usually most of the unis have a selection of very different halls available, so read very carefully about each of them and what sorts of people usually live in them. Usually, the more expensive ones are a bit calmer...