In reply to ow arm:
From the car park on the B5106 cross the road and head up the road(steep concrete road that leads up to the Cowlyd water works) , after 10yards, turn off on a footpath that goes to the start of the gorge walk. you'll pass a notice board which has a map of the gorge, which may assist. However in a nutshell, its a fairly straight forward(what you see at the start is what you get) and it terminates at the long waterfall with a path out on the left which takes you above it and back across the river above and out onto the steep road that leads back down to the main road. Have a recce if unsure.