"How on earth do they work out that Camille is the weakest link when everyone answered their questions right in the first round including her?"
I thought this exact same thing. I think it was because everyone else answered three questions, but she only answered two because the time ran out just before it got to her. Doesn't really seem fair, but heyhey.

I wanted a John/David final. Ah, well, I'd rather Camille won than Noel.