I've rarely seen a £50 note and I've NEVER seen a £100 one at all!
In a room nearby was a small drop in event which was part of the festival. It was called The Hitchhiker's Guide to the Solar System. Here you could talk to the astrochemists etc about there work and ask them questions. You could also hold real pieces of the moon collected by Apollo Astronauts as well as pieces of Mars and 4.5 billion year old meteorites. You could look at them under microscopes too which I did. It was very pretty. I had an interesting chat to an astrochemist who spoke about her work looking for organic content in rocks.