Colin says: By the way.... the plain wodden objects on top of the boulders are a set of wheel chocks that (as it happens) I didn't actually need. The barrier itself serves to prevent the wheeled ramp from making off backwards down the hill and into the sea.
(To save this picture as Windows Wallpaper - right click it -
then select "Set as Background") (or click the above image to see the full sized version)