I've heard rumours that the universities don't really care about the personal statement (they're generally more interested in your grades). They only use it to confirm you're not retarded. This was somewhat confirmed when a lecturer from Kent university told me not to worry about the personal statement because they practically skim read it. My friend who went to Cambridge taster day also had a lecturer say that they don't care about the ps, extracurricular etc merely the grades. But tbh for oxbridge you've got the interviews so you're gonna need a pretty beefy one. tl;dr don't stress about the personal statement because many universities just care about the grades