We came across your site when searching for confirmation that we had found the source of the Ribble as Gladys Sellers depicts a significant gorge unlike anything we could locate in our 2 hour search of the surroundings. Also there is now a man made 7ft. wide gravel track leading up to the wall & a new gate which we assumed to be your photo of Gavel gap. Have you any ideas as to the purpose of it? It ends about half a mile after going through the gate.