I understand your concern about the foreground rocks, I along with many others love capturing scenes in the Peak District and you would think with the ammount of rocks it would be easy to get some great foreground interest, which is not always the case
, although I do think in this image the rocks work and they are not over dominant.
My concern is the wall, for me it's not acting very well as a leading line, a leading line acts as a path for the eye to follow through an image. Usually they start at the bottom of the frame and guide the eye upwards and inwards, from the foreground to background, typically leading toward the main subject. When using lines to direct the viewer’s attention there are two simple rules that work to make a stronger image. First, make sure that the lines always point toward the most important object or area in the image, this will take the viewer’s eye directly to that area and secondly, make sure that the lines never point outside of the image. Lines that point outside will make the viewer’s eye leave the image, not something you want
and weakens the image which may result in the viewer losing interest in the image entirely.
Of course leading lines can be Vertival, Horizontal, Diagonal and Curved, in fact any shape.
For the wall to have worked in this way I think you would need to be a lot closer to it and if there's a gate or style in it use that as your foreground interest and have the wall leading you to the water and distant hills.
This is just my view and what works for my eye may not work for other's.