Lavernock (Welsh: Larnog) is a hamlet in the Vale of Glamorgan in Wales, lying on the coast 7 miles (11 km) south of Cardiff between Penarth and Sully, and overlooking the Bristol Channel.

Following these successful trials, Marconi subsequently vested his new patent rights in his 'Wireless Telegraph and Signal Company', which unfortunately prevented any further co-operation with the Post Office engineers.

In 1948, to mark the 50th anniversary of the experiments, a bronze plaque was unveiled by the Cardiff Rotary Club inside the courtyard of the recently closed church of St.Lawrence, Lavernock, commemorating the historic radio transmissions over nine miles (14 km) of open sea.

The small stone hut that Marconi used to contain his experimental radio telegraph equipment still stands on the cliff edge at the end of the lane near Lower Cosmeston farmhouse.

The hundreds and sometimes thousands of holidaymakers were served refreshments by an ice cream parlour, two busy cafes, the Golden Hind public house and the three star Lavernock Bay Hotel.

Very few visitors arrived by car until the 1960s with the majority travelling by the half-hourly steam trains that stopped at Lavernock and Swanbridge Halts on the busy Taff Vale Railway Line en route to Barry Island.

Because of the extreme tidal range there are very strong currents or rips close inshore to the point with speeds that exceed 7 knots (13 km/h; 8.1 mph) for several hours at each tide.

[3] Various proposals have been put forward to construct a Severn Barrage for tidal electricity production from Lavernock Point to Brean Down in Somerset and the provision remains under discussion by the various agencies.

The coastal cliffs which stretch to the north and east of Lavernock Point expose a sequence of sedimentary rocks of late Triassic and early Jurassic age.

[5] In 2015 Nick and Rob Hanigan discovered a fossilised skeleton belonged to a dog-sized creature, a theropod dinosaur, and a "cousin of the giant tyrannosaurus rex".

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.

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 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.

The unimproved limestone grassland supports varied and colourful plants such as dyer's greenweed, devil's-bit scabious, common spotted orchid and fleabane.