Great to hear this, OP, thanks! Also a relief, as no coaching here, other than asking DD what she likes and what she is good at (the latter being very little, according to her). But on the other hand we also had no clever prep (like horsemadmum) as DD is at state school. Anyway, despite being very nervous before her very first interview, DD came out relaxed and smiling, well done to the interviewer! (Huge relief, not just for that school, but for the whole process we're putting DD through)
But the interviewers deserve some of the blame for poor interviews (lack of "real" engagement) if they don't manage to create a relaxed atmosphere. Small things matter, and if the schools really want this, they should use all kinds of tricks (say cookies, sofas, real smiles, casual clothes, superfriendly helpers, something funny, whatever works).
I could feel my DD tighten up waiting for her interview at a second school when a very formal man (his body language, tone as well as the suit and tie) stood over her saying "I am Mr So and So" etc. When they walked off to an interview room, I was left fearing and expecting the worst and feeling that unnecessary ice had just been created which would not easily be unfrozen in the few minutes. (It didn't)
These two schools likely have widely different views on my daughter - because only one met the real, relaxed, thoughtful, quite articulate and opinionated girl - rather than the anxious, lost-for-words one.