hey @kansuze,
first of all congratulation for the curation, it always makes the author happier. Personally I am not a fan of so-called "Hop-on Hop-off"buses which are very common in the most popular tourist cities or destination points. Always when I am travelling, I am trying to avoid them and reach everything by myself, but honestly I've never heard about this kind of activity related with THE BEATLES which I consider as one of the most important bands ever ! I really envy you and as I am a typical hater of the commercial tourist solutions, this time I would be the one sitting on the front, listening like a kid everything what a travel guide had to say for the whole two hours of your journey :)
great fun, great post, great idea !