The volume of access schemes Oxford has is absolutely staggering. I think most people just have no idea how much goes on, how much time people invest, both professionals and student volunteers, how hard people work, and how much money is spent (upwards of £10m a year!).
For example, I applied for the Sutton Trust Summer School this year. I was virtually certain I'd be taken on, partly coz I had a fair bit of experience of access work, but mostly because I expected them to be struggling to fill all their places. A few weeks later I got an email saying "sorry, but we had eight (!) applicants per place". A huge number of Oxford students try to get involved and help with widening access.