This summer my parents are going to be in the Netherlands for a month, so my brother and I have hatched a plan to take a long weekend and cycle to see them. We were thinking of doing 3 days: London-Harwich to the overnight ferry, Hook of Holland-Utrecht and stay the night, then Utrecht-Hook and an overnight ferry and train back to London. What's the London-Harwich journey like? Does anyone have a decent route, or should I just see what cycle.travel or similar suggest?