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HER Number:7365
Name:BLOCKHOUSE - Medieval blockhouse


A blockhouse, 8.5m long by 6.7m wide, overlooking St Helen's Pool and Old Grimsby harbour.

Grid Reference:SV 8973 1546
Parish:Tresco, Tresco, Isles of Scilly
Map:Show location on Streetmap

Protected Status

  • Listed Building (II) 62554: THE BLOCKHOUSE

Other References/Statuses

  • OS No. (OS Quarter-sheet and OS No.): SV81NE 28
  • Primary Record No. (1985-2009): 7365
  • SHINE Candidate (Yes)
  • SMR No. (OS Quarter-sheet and SMR No.): SV81NE 12

Monument Types

Full description

An old blockhouse is recorded on the 1963 OS map. In the Parliamentary Survey of 1652 it is called 'Dover Fort' (b1). Recorded in 1796 by Troutbeck as 8.5m long by 6.7m wide, with two store platforms on top, secured by a parapet (b3). A description of the blockhouse as it now stands is given by O'Neil (b1). It consists of a rectangular platform paved with stone, raised high on a carn overlooking St Helen's Pool and Old Grimsby harbour. It originally had a parapet with embrasures at the west end of the north and south sides. Meagre living quarters were provided with originally a lean-to structure in the soth west corner, and later a room was added to the south west corner with access to the platform. The blockhouse is a Listed Building, Grade II (b4) and the OS field worker confirms O'Neil's description (h2). The site was visited in 1988 (h3). The blockhouse was as described by O'Neil and the OS fieldworker; the platform being an irregular quadrangle approx 7.0m NE-SW by 6.5m NW-SE, raised 2.1m from the ground to the SW side where it is reached up stone steps, and further where the ground falls away to the cliff. The walls are approx 1.0m thick, of medium sized stones above massive boulders and rock outcrops in situ forming the lower courses, and survive to 2.5m above the platform at the entrance. The annexe, 2.8m NE-SW by 3.6m NW-SE, appears almost intact, with windows and fireplace. The monument was included in the Schedule on 11/5/1950, confirmed on 9/10/1981, amended on 1/4/1994 and revised on 16/1/1996.

Site history:
2: 1978. NVQ/OS
3: 1988. PARKES, C/CAU

<1> O'Neil, BH St J, 1961, Isles of Scilly MOW Guide, 25-26 (Bibliographic reference). SCO4042.

<2> Ordnance Survey, 1970s, 1:10,000 OS Map (Cartographic materials). SCO4045.

<3> Troutbeck, J, 1794, Survey of the Ancient and Present State of the Scilly Islands, 133 (Bibliographic reference). SCO4965.

<4> DOE, 19--, Listed Building Description (original DOE), NOV 1954, 7 (Bibliographic reference). SCO5173.

Sources / Further Reading

[1]SCO4042 - Bibliographic reference: O'Neil, BH St J. 1961. Isles of Scilly MOW Guide. 25-26.
[2]SCO4045 - Cartographic materials: Ordnance Survey. 1970s. 1:10,000 OS Map.
[3]SCO4965 - Bibliographic reference: Troutbeck, J. 1794. Survey of the Ancient and Present State of the Scilly Islands. 133.
[4]SCO5173 - Bibliographic reference: DOE. 19--. Listed Building Description (original DOE). Listing "Greenbacks". NOV 1954, 7.

Associated Finds: none recorded

Associated Events: none recorded

Related records

7365.01Parent of: BLOCKHOUSE - Medieval blockhouse (Building)


Scilly  © Cornwall Council

Scilly © Cornwall Council

Scilly  © Cornwall Council

Scilly © Cornwall Council