I'd say the University gets significantly more diverse every year. In terms of the feeling of wealth divide; it is something that you would definitely observe at some point, though, depending on what societies you join, you'd notice it more/less i.e. joining the shooting, hockey or skiing society. But there's also a wide variety of clubs to join to feel more at home. Honestly, Exeter is such a good Uni with the balance it has between academic reputation and campus life.
ps.. nothing can prepare you for the amount of signet rings, Canterbury trackpants, Schöffel's and Tom's trunk you'd come across ahaha