I didn't have an interview for medicine – thank God! – but I still had one at King's. In my experience, it wasn't all big and scary and hyped like an Oxbridge one, but the questions were still of that calibre – I even had quite a few which were identical. The lecturers I met were really pleasant and welcoming, and didn't have a holier-than-thou thing on the go, which was good.
So, that was probably worse than useless, but I hope it might calm you down a little bit! But I don't know, maybe the medicine professors are complete bastards yer.