I know I'm not that person but I second their opinion that quoting these things gets less important (especially if its post a vac scheme). If you do want to mention them, you could potentially frame your answer in two parts with - "This is why I applied" as one section where you quote this info and the second section as "This was my experience and now my motivation has just increased".Thanks, that is very interesting. So did you only talk about your experience with the firm rather than quoting things like matters, USPs etc? Was this through talking about their initiatives and so on and explicit examples, or just the feeling you got?
Honestly, sometimes they might just ask you a question like what surprised you about the firm based on what you knew before the vac scheme and now that you've done it rather than ask the typical why firm question.