Sorry about dragging it up. I was scrolling through some of my old posts...
It's something post-graduates experience more because the Souk (world music) night is held at the Post-Graduate Centre (and I'm sure there are other factors - like accommodation).
I was different to most undergrad students in that I had a lots of housing problems and lived in many different places, so I got a good mix of sexualities, nationalities etc. who I shared with. I made great friends with some of them and it was sad to see them move on, but I really was a bit shocked by the clique-y groups formed amongst some fellow undergrads.
I could talk for hours with Italians I'd just met and get invited back to a house party, and chat with them till the early hours, perfectly innocently, but if you were to even say hello to some of the English people I knew (some quite well) and you were outside of their little group, you would get looked at like you were weird, or had some kind of hidden motive, or simply not cool enough for their group, or sized up by the group in order to assess whether you could possibly be cool enough to join it.
I now live in the Luton area and find that everybody is stand-offish generally here, and the races/groups/nationalities never integrate and the differences seem very pointed.