There were 2 separate interviews in the day for History and Politics, with each being roughly around 20 minutes. For me, there were 2 interviewers for both of the interviews.

I had my Politics interview first, and it's the one I left feeling better about. At a specified time, I was instructed to collect a piece of source material and given a while to read it and walk to the interview building about 10 mins away. There are was more than enough time to read and reread it, and prepare a full response so no worries there.

The interview started off with questioning on the material and grew naturally from there. Really early on I felt safe with my two interviewers and ended up having a really fun conversation. It was pretty topical, which meant that Brexit and Trump were a big part of what the conversation revolved around at least subconsciously.

My History interview was more rough than my Politics one, but I still can't tell if it was because I wasn't prepared or because I was given a harder time by my interviewers. To start with, they mentioned the History essay I had submitted as part of my application to King's, and asked me some questions on it. This immediately put me in the back foot as I had written the essay almost a year ago and the questions they were asking weren't on material I had been taught anyway. Instead of just saying I didn't know I tried to guess from what I did know and I think they knew I was fumbling around.

From then onwards the interview went into a discussion on the path of history, grand narratives and historiography. While that part wasn't a failure overall the interviewers were less friendly, more forceful and much more inquisitive into any weakness I showed. Only tip I have for this is to be prepared on any material you might have sent in.

In both my interviews, the interviewers were very aware of what I had written in my personal statement, and both times they picked up on little things I had peppered in to show my true interests.

My general tip is to have a political position/paradigm/worldview of your own that you can analyze things within, so for example I came at everything as a libertarian/classic liberal and so had no trouble being consistent. Things you can do to practice this is reading up on political literature from your side of the aisle, and getting in the right frame of mind for it.

Remember that these people are human, and connect with them. Don't be too informal but do not be a stranger either.