I haven't seen this episode yet, but referring to another quiz show, a higher than average IQ might help you guess at Isambard Kingdom Brunel as a famous engineer, instead of looking blank. I keep bringing this one up, I know, but it bugs me.
However, while I believe that my (relatively) high IQ might be linked to my reasonably good research skills (enabling me to answer a few questions now and then here on AB), I'm the first to admit that my actual knowledge about most things is abysmal.
You really, really wouldn't want me on your pub quiz team!
Chris Tarrant also said there's no point in trying to learn things in preparation for appearing on Millionaire, as there are so many possible questions. However, knowing the dates of kings, queens and presidents etc. can help you answer many other questions to do with a particular time in history.
I think she very attractive, too. It's mostly her face, I think, then body and brains. She's not far off Anne's size and braininess, so the face has to be the key thing.