Hello - this is my first post on here. I'm working abroad at the moment so this is definitely out of my grasp, but I want to see if I can help!
If you search for Kemble on Google, you find Kemble Pianos which has a photo of Westminster bridge on it - near to the Waterloo Pier that the clippers stop at. Also the thamesclippers.com home page has an advert for Tutankhamen and the Golden Age of the Pharoahs, so it MUST be the right track.
Looking at the timetable, four stops from Waterloo Pier takes you to Canary Wharf.
In fact, I just noticed that if you look at
http://www.thamesclippers.com/fleet/view/193 you will see that the MONSOON has an advert for the Tut exhibit so maybe that is the actual boat you need to get?