Well what I initially thought is this:
If you are facing the entrance of Benefactors ( so that kinda makes the SU and Arts Centre to your back), then Westwood is in front of you. However, recalling the way I used to walk with my sister (I did my work experience there and stayed with her) to Tesco's, then its kind of the other way. That's whats confusing me. But I may have Westwood's location wrong.