18 miles. Rained in the morning. We discovered the above stretch of visible Vallum (EDIT: Or possibly the defensive ditch to the north judging by the position of the Military Road in that picture) just as the sun came out - hence B's umbrella. Sunny in the afternoon. Staying at an extremely nice B&B near the Mithraeum at Carrawbrough.
Blisters improved but I still hobble whenever I start walking after a rest.