Hi, I was up there on last Thursday with a group of walkers, and we specifically went to the spot previously identified, four of us all had various different GPS devices so it wasn't as though I had a dodgy gps signal, it was the same for all of us, all we could see at the point marked was a rough hollow in the ground, it wasnt even at the highest point, it looked nothing like a seat or anything really just a patch of moor with no real features, we also checked it with the OS map and everything points to a feature at the other side of the wall, if you look on the satellite view there is  big limestone rocky outcrop which could be described as a seat, so much so we all sat there and had our lunch, the cairn on top of the fell is already marked so I believe what is described on the OS map as Lord's seat is not the highest point but a limestone feature of the other side of the wall where I have marked.