Because of the nature of Porthleven Harbour, great surf is created at the entrance to the harbour just as it would be if the swell were coming up on a beach. This is a favourite spot for local surfers who enter the water at the edge of the harbour. In the picture below, if you look very carefully, one guy can be seen with his board on the steps of what I think might be the old lifeboat station. They then paddle out to enjoy some exceptional surf and great wave riding, even on a freezing cold March day like today..
32mm f/11 1/160 sec. ISO-100