I was wiht a business colleague in N London when they had a quiz night. We had just gone for a beer. They asked some question and I gave the answer to him, and was overheard by a girl who had entered. 'Are you sure' Yep, absolutely.
The next question was 'who was the last person to be imprisoned in the Tower' which I also knew (Rudoph Hess) so I gave her the answer. At that stage the question master got iffy and said if we had not entered we could not answer the questions. So i whispered a few answers to my new rather nice looking friend, and she won!