Press Packer Chris met author Jonathan Stroud and together they travelled around London in style - in a limo!
Check out the inside of their limo - it even had a TV!
All this sightseeing is hard work, time for a drink!
They drove around loads of London sights that are mentioned in Jonathan's book, the Bartimaeus Trilogy. Here they spot Big Ben!
Jonathan shows Chris his notebook where he wrote his first ideas for his book
Chris and Jonathan outside the British Museum - which is featured in the Trilogy
Here they look at artefacts in the Museum that inspired Jonathan's characters
After a long day it was time for time for tea and cakes at a posh London shop - and time for those autographs which was the icing on the cake!