What a disappointment! It's curious that they would allocate you to Nutford, when they clearly state that it's mostly on undergraduate hall. Is there ANY way to clarify or to seek a change? I know it would likely be hard, but it might be worth a try. Did you even list Nutford as any of your choices? I don't know much about this hall, but hopefully others will reply and let you know if there are other PGs there. If so, from my understanding, they do make an effort to group postgrads together. It might not be that bad if that's the case. Good luck!