Yeah I am going to be in London the morning of the 13th, then I am staying an extra night in London at the end. I believe that date is the night of July 13th, then fly back to the states the 14th. I haven't chatted with anyone in my tour group yet, but hopefully I can meet a few before leaving so we can catch up for drinks before the tour begins.
Have you every gone through Contiki before? This is my first time, and from what I have heard it is such a great time.