No problem! I'll try my best to remember...
I had 2 interviews at Balliol (pretty much everyone has 2 interviews at their first choice college). Some people got called to other colleges for more interviews, but I wasn't one of them.
The whole experience of interviews was amazing - you get to stay in college for 3-4 days and I made some great friends who I'm still in touch with now.
The History interviews at Balliol seem to follow a very specific structure that they've obvs decided is a good way of doing things. Because of this tho, my experience is very Balliol-specific! So your interviews may be quite different.
My first interview was based entirely on the essay I submitted (side note - make sure the essay you submit is something good and that you found interesting/you feel like you could discuss!). The two tutors went through it and raised certain points about it. We basically discussed it, going a little deeper and them pushing me a bit further every time. That's when you get questions like, as I got in mine, 'what is modernity?'. But the thing is, thats not an out of the blue question - we had already been discussing the people's desire for more from politics, I suggested they wanted modernity, they asked me how I would define modernity. So it all builds up to the big questions
I felt like that first one was really fun, even if I couldn't tell how 'well' it had gone (it's really hard to tell!).
My second one was almost entirely based on an excerpt from a historical source they gave me - mine was a letter from Walter Raleigh. They told us they had deliberately chosen stuff we hadn't done at school, so we'd know nothing about it! I got 25 mins to read it beforehand, and then they asked me about it - again starting with really simple questions and building up into really stretching stuff. The tutors were really friendly in both and we had a laugh about the source, which was pretty sexist! I felt like this one went less well than the first, but I think everyone feels that with the source one cos you feel on the back foot all the time (with the first interview I knew my essay inside out; I'd never seen the source before).
So there's my experience! I wasn't asked about my PS or application at all, which I was really surprised about. Prepare for them to ask you, though - could just have been the tutors' whim on that day! I really enjoyed my interviews but I was super nervous beforehand - for one of them I went to the wrong place to start with and had to sprint to a different building, and in the second one I couldn't open the door on the way out and one of the tutors had to do it for me! So the moral of the story is, they don't reject you just cos you did something really stupid 😂
Hope this helps!