Kennet and Avon(Bristol to London)

Last year a friend and I cycled along the Kennt and Avon canal tow paths from Bristol to London.
This was a lovely ride, not only because of the wonderful scenery but also because there(obviously) weren't any hills on the tow paths. Having said that there were parts where the tow paths weren't usable and we did have to clomb the odd hill but nothing major.