Like most universities, it does have quite a diverse postgrad make up (in terms of nationality and ethnicity). Something like 70 nationalities in the business school alone. But not terribly diverse at undergrad in terms of ethnicity, disability or socio-economically.
There is a University of Teikyo campus in Durham so because of this, and our universities tend to be quite popular with Chinese postgrads, you can't help bumping into Chinese students.
But in all my time at Durham I've only ever seen five black students (and probably as many South Asian students). Plenty of Arabic and Persian students and academics, but I am partly based at the School of Governent/Institute of Middle Eastern Studies so it's not surpising I have frequent contact with them.
Ever been to the South West? Or northern Scotland?
Obviously urban areas will be where you'll find large immigrant populations and ethnic minorities and, being a small city (with a number of traditionally white, working class former pit villages outside).
Elsewhere in the region this is not necessarily the case. Even so, recognising the large Pakistani population in the West End of Newcastle, Sunderland, the large Jewish population in Gateshead, Newcastle's Chinatown, and that South Shields was home to the very first settled Yemeni community in the UK, the Tyne and Wear Metropolitan area still isn't the most diverse. Especially considering it's one of the largest in the country. As mentioned, County Durham itself is very white, I admit. The East being traditionally industrial and the west being rural.
Durham itself is very white, as are the villages outside it.
Whether you would feel "left out" or not is another matter. Depends whether you're desperate to be with other people of Pakistani origin. There's no reason why people, whether White European, Hispanic or Thai won't make you feel welcome.
To be fair, we have the Institute of Middle Eastern and Islamic studies, which attracts a considerable number of staff and students from the Middle East, North Africa and South Asia as well as vibrant Islamic Society. I don't know about hundreds, but there are certainly many practicing Muslims settled in Durham.
An academic who taught here a few years ago told me the Mosque is actually in a pub. That's quite interesting....I imagine most go to Sunderland or Newcastle though.
Edit: - Oh, turns out it's beneath the Dun Cow.