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Flat Holm Coastal and Anti-aircraft Defences is a Second World War military installation located on Flat Holm Island in the Bristol Channel, Wales. The site comprises coastal defence and anti-aircraft gun positions established to protect against enemy air and naval attack during the conflict. The surviving structures include gun emplacements, searchlight positions, and associated military infrastructure typical of British coastal defence fortifications of the 1940s period. These defences reflect the strategic importance of the Bristol Channel as a vulnerable coastal zone requiring active military protection during the latter stages of the war.
Flat Holm Coastal and Anti-aircraft Defences is a scheduled monument protected by Cadw under reference GM595. View the official record →
Flat Holm Coastal and Anti-aircraft Defences is a Second World War military installation located on Flat Holm Island in the Bristol Channel, Wales. It is designated a Scheduled Ancient Monument by Cadw under reference GM595.
Flat Holm Coastal and Anti-aircraft Defences dates from the post medieval/modern period, and is classified as a battery. It is one of over 32,000 scheduled monuments protected across Britain.
Flat Holm Coastal and Anti-aircraft Defences is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is GM595.
Several scheduled monuments lie within 10 km, including Three Palmerstonian Gun Batteries, Flat Holm (0.1 km), Flat Holm Victorian Rain Water Catchment (0.1 km), Flat Holm Victorian Rock Cut Defensive Ditch and Rampart (0.1 km).
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