DD's Bristol offer last year came through very late when she was immersed in course work and revision, plus she had not been to an open day, so I did so desk research for her.
Interestingly posters in The Student Room seemed to prefer the newer, private City Centre accommodation on the basis it was closer to night life and more likely to offer en-suites, neither of which are important to DD. In the end she deferred her place, so has bee dong her own research.
She will want to be close to sports facilities, which I understand are in Stoke Bishop. In terms of social mix, there are private schools and private schools, in the same way that there are state and state. DD was in a City Centre co-ed and suspects she won't necessarily have have much in common with those coming out of single sex boarding schools. (There was a noticeable and rather flash London party circuit which seemed to have a heavy mix of London based boarders returning for the weekends. Not something either DC was interested in then and not a group they would want to pick up with at University) Her school also does not seem to have much of a tradition of sending pupils, especially scientists, to Bristol, and indeed she will be the first medic for over a decade. Wills is on her list of places to avoid.
Working a ski season has been a great way for her to branch out beyond her London social bubble, which ought to stand her in good stead at University. But actually I don't think either her or her brother's friends have based their University friendship groups on background. Perhaps this is more of a humanities thing. Instead friends seem to share course or interests, and include a good tranche of international students. DD will take people as she finds them, and I hope others do the same with her.