Thanks for the routesheet etc Phil D.
The train tickets have arrived. It looks as if I may actually do this to myself.
The org's comments highlighting the change from 4 sections to 3 worry me slightly. I haven't done more than a handful of 200s and none have been remotely comfortable for me in the last 3rd of the ride. Part of the problem, besides sheer lack of general backbone, is that I don't have the eating and drinking right.
Can any of you familiar with the route, bearing in mind the above, give me an idea of when / how often you plan to eat during the ride or when you'll have your main meal of the ride, given the early start time and the reduced number of stages.