These were cast at Pimlico and shipped out to be erected by comparatively unskilled labour. Some still survive in Jamaica and Bermuda, and a cast-iron tower at Tiri-tiri, New Zealand, built in 1920, is one of the last in this material. Whiteford Lighthouse is the only cast-iron lighthouse in Britain which is wave-washed, although it can be reached on foot at low tide. The handful of other surviving lighthouses of this type stand well clear of the water on either harbour piers or reefs. Whitford Lighthouse is listed by Cadw as Grade II* as a rare survival of a wave-swept cast-iron lighthouse in British coastal waters, and an important work of cast-iron architecture and nineteenth-century lighthouse design and construction. It is also a Scheduled Ancient Monument.