I liked this, SirFurry...a dike (dyke) built a bit after 750 AD, and now these folks are hiking along it, with portable solar power they use to recharge their cell phone batteries!
...and they stop at a farmhouse to refill their water bottles, with all those English creeks running through the countryside. Well, hiking in the 1950's, we would NEVER carry water, just drinking from any creek we happen to cross! Now, however, the creeks are full of Giardia lamblia, as well as other parasites and various fertilizer or other chemical contamination, and who knows what else...
oh well, this is progress! Right?