Are there any preppy, upperclass white people at warwick?

Objectively (pick and choose your data):

Ethnic Origin of the UG population (Highest 5 by percentage. Note: 8.3% refused information):

White: 61.2%
Chinese: 8.8%
(Not Classified: 8.3%)
Indian: 7.9%
Asian (other): 3.6%
Black African: 2.8%

Social Class of the UG population (Note: 44% refused information):

(Not Classified: 44%)
Higher managerial and professional occupations: 21.1%
Lower managerial and professional occupations: 17.1%
Intermediate occupations: 6.5%
Small employers and own account workers: 2.9%
Lower supervisory and technical occupations: 1.7%
Semi-routine occupations: 4.8%
Routine occupations: 1.4%

I wouldn't trust the data for Social Class as it is self-defined, but hopefully that gives you an indication.