Gaz I cannot help the picture is rather blurred but I would certainly recommend you using Terry's [Maltrab] brilliant Location Map which you access by clicking the tab at the top of the main screen . It's a labour of love and well worth a view . There are some great photos in the members photos section which are also worth spending time viewing as a new member .
If you park up at Binn lane at the junction of Wesseden rd just outside of Marsden you can walk to the location up a no vehicular rough track(Wesseden rd). Probably a mile or so along the side of reservoir, & just passed a Pennine way signpost. I think the sign has been updated since I took the photo.