added during the Second World War. The World War II gun emplacements formed part of the Fixed Defences, Severn Scheme and protected the Atlantic shipping convoy de-grouping zone between Cardiff, Barry and Flat Holm. Today the remaining main section of the gun battery has been listed as an Ancient Monument, which includes the gun emplacements, director-rangefinder observation position, crew and officers quarters. The structure is still commemorated through Lavernock Point's main access road being named 'Fort Road'. Royal Observer Corps A few yards away from the historic Marconi hut Penarth's only World War II Royal Observer Corps (ROC) Searchlight post stood on the cliff edge with its clear views over the Bristol Channel and the islands of Steep Holm and Flat Holm. The Observer Corps site was established by the Air Ministry on part of the original War Department land connected to the Lavernock Gun Battery. The volunteer ROC observers spotted many Nazi German Luftwaffe raids approaching across the channel and activated the air raid warnings in the town. In early 1962 a protected nuclear fallout shelter (or bunker) was completed at Penarth Clifftop for the ROC (OS Grid Ref: ST 1858 6903), who by the 1960s had switched from above ground aircraft spotting to underground operations with instruments to detect nuclear explosions and warn the public of approaching radioactive fallout in the event of nuclear war. The post members were mobilised later that year and volunteers spent nearly ten days underground during the Cuban Missile Crisis as the government prepared the country for potential outbreak of war. The Penarth cliff top nuclear bunker was closed down and abandoned by the ROC in 1975 after repeated destructive break-ins by local vandals, but the concrete entrance hatch and ventilator tower can still be observed next to the cliff walk near Lower Cosmeston farmhouse. The Royal Observer Corps itself was disbanded in December 1995 after the end of the Cold War and as a result of recommendations in the governments Options for Change review of UK defence. Nature reserve Lavernock Point is established as a particularly fine nature reserve where wildlife interest is combined with historical interests in a dramatic and picturesque coastal reserve. The unimproved limestone grassland supports varied and colourful plants such as dyer's greenweed, devil's-bit scabious, common spotted orchid and fleabane. Butterflies have been observed and recorded by the reserve's warden for over twenty years and more than twenty