Thanks a lot all.
It's a natural route choice from the map. The northern half was a gradual line of least resistance over the high ground for the Roman legions to avoid being ambushed in the (then) tortuous and boggy valleys, a great scenario to contemplate and the only one where I feel any historical interest or connection.
The Parula 2 is an excellent spacious tent once the apparently self-aware pole system is mastered and tamed!.
I wasn't aware of the Kentmere dam work, but it's looking good at the moment at least from a distance, unlike the sad Peak District reservoirs of late.