Measurements taken on Sunday Jan 24 2016 confirm that movement is continuous. The interior of the crack is fairly dry and frost action hasn’t been an issue and root-jacking does not seem significant either. A rope was dropped down the cleft the rope and the knots went straight down the crack without hesitation - that's a first. Given the flooding in road erosion in the Thirlmere area and this ongoing rock movement there are some interesting geological processes in the Thirlmere area!
In reply to djwilse: I would think the problem is not so much repairing the A591, more repairing it so that it can withstand a similar bout of weather without significant damage.