Hey Rog there was a "story" current when I was at sea that a small (about 800 tons) ship came out of Avonmouth late at night after everyone had been on the p**s except a first trip young sailor, the skipper told him to steer straight for the Runnelstone lighthouse off Cardiff, and went below for a rest. 4 hours later the ship tried to climb the side of the Runnelstone!! It was lost , all hands saved.