Yeah I guess Cambridge is quite homogenized, in several ways. I was so shocked when I came on open days and I only saw a tiny group of black people, and the place was full of people who spoke with RP accents (I speak like that too, but I come from London so it was weird not being surrounded by different accents and races). It seemed especially odd when you think that Cambridge is world-famous, and yet so many of the open day people were from the 'same mold'. Of course that could just have been the particular open days I went on, but it was still strange.