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Cof Cymru: National Historic Assets of Wales · Wales

Limpert Bay Anti-invasion Defences

Llantwit Major, Vale of Glamorgan, Wales

A scheduled monument in Llantwit Major, Vale of Glamorgan, recorded as Anti Invasion Defence Site (Post Medieval/Modern).

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Limpert Bay Anti-invasion Defences, Llantwit Major, Vale of Glamorgan, with a pin at the register's coordinates
Ordnance Survey six-inch map, 2nd edition (1888–1913), covering this location. Courtesy of the National Library of Scotland. The pin is ours, placed from the register's coordinates.

The record

Designation
Scheduled monument
Site type
Anti Invasion Defence Site
Period
Post Medieval/Modern
Date of designation
15 January 2008
Community
Llantwit Major
Unitary authority
Vale of Glamorgan
Country
Wales
Coordinates (centre of the scheduled area)
51.38814, -3.42550
SAM number
GM601
Cadw record number
1243

Slide toward Today to fade the historical sheet and see the modern map underneath.

David Rumsey Map Collection, Stanford Libraries

5 historical maps cover this location, the earliest the 1636 map "Cornubia : Devonia, Somersetus, Dorcestria, Wiltonia, Glocestria ..." (David Rumsey Map Collection, Stanford Libraries).

Historical maps covering this location

  • 1636 · Cornubia : Devonia, Somersetus, Dorcestria, Wiltonia, Glocestria ... (David Rumsey Map Collection, Stanford Libraries)
  • 1637 · The fourth table of England. Cornub. Devonia, Somerset etc. (David Rumsey Map Collection, Stanford Libraries)
  • 1858 · 20. Bridgewater. (David Rumsey Map Collection, Stanford Libraries)
  • 1865 · England and Wales. England No. 6. (David Rumsey Map Collection, Stanford Libraries)
  • Sheet 7 South Wales (University Library, Vrije Universiteit Amsterdam)

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This record in Cadw's own full report ↗

Cadw's description

The following provides a general description of the Scheduled Ancient Monument.

The monument consists of anti-invasion defences, dating to the early period of World War II (AD 1940-41), that formed part of Western Command's coastal crust defences. They are aligned east-west and extend for 1.8km overlooking the gently shelving beach at Limpert Bay to the south. The monument consists of six reinforced concrete pillboxes and three surviving sections of the single anti-tank cube alignment that linked some of them together. The two pillboxes at the west end are hexagonal in shape and constructed from reinforced concrete with red brick shuttering. The remaining pillboxes are irregular in design and plan, except for Item E, which is of standard FW3/22 design. Each anti-tank cube measures 1.54m in length and width, and 1.45m in height. They are spaced at 1.1m intervals and arranged corner to corner.

The monument is of national importance for its potential to enhance our knowledge of World War II anti-invasion practices. It is well preserved and is an important relic of actions taken against the perceived threat of a German invasion from Ireland. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. The importance of the monument is enhanced further by the group value of the individual items.

The areas scheduled comprise the remains described and areas around them within which related evidence may be expected to survive.

Nearby in the register

Other entries of the same register within about three miles of this one, by straight line.

Designated Historic Asset GIS Data, The Welsh Historic Environment Service (Cadw), 2026-09-07, licensed under the Open Government Licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ Cadw, the Welsh Historic Environment Service · Open Government Licence v3.0
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