Exact same dilemma i am in, Im british asian and have an offer for CS at Bath and sheffield. Ik Bath is better but everywhere ive tried to look, its mainly just saying that a huge majority of people are white, which i dont have a huge issue with but i personally find that i get along with other races more easily and naturally. At this point i dont really have a choice whether i want to go there or not as I only have two offers, but it would be nice to feel some comfort by the fact that there are others who are worried about the same thing.
Edit: another thing i realised is that most of the threads/discussions etc ive seen about diversity in Bath were really old, like 5-10 years ago, and the fact it has gone up rating quite a lot since then has given me some feeling that it has maybe slightly changed, due to attracting a wider audience of applicants.