Hare Warren Control Station


Heritage Category:
Scheduled Monument
List Entry Number:
Date first listed:
Location Description:
Site is near the South West corner of Hare Warren at SU0860128794. The site is in woodland and the area is overgrown.


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The building or site itself may lie within the boundary of more than one authority.

Location Description:
Site is near the South West corner of Hare Warren at SU0860128794. The site is in woodland and the area is overgrown.

Wiltshire (Unitary Authority)
National Grid Reference:


This wireless station is located in Hare Warren woods, at the southern end of the Wilton Park Estate. It is an underground structure divided into operational, accommodation and service areas, with some surviving fittings.

Reasons for Designation

The wireless station at Hare Warren Woods, Wilton, Wiltshire is designated as a Scheduled Monument for the following principal reasons:

* Historic interest: the perceived threat of imminent German invasion and occupation was so great in 1940 that the formation of the Auxiliary Units was given priority by Churchill, and secrecy was paramount for its potential success. By 1944, this threat was considered negligible; nevertheless, the continued value placed in a secure and secret communications network prior to the Normandy invasion is indicated by the construction of this ‘super’ control station; * Rarity: this is the only known control station of its type, in terms of scale, plan and operational capacity; * Survival: this site, along with all of those in the network was stripped of equipment at the end of the Second World War. However, many fittings survive including bed frames, operator positions, generator housing, doors and cabling. The station survives largely intact although the roof structure is breached at one location; * Potential: the station is the last to be built on the Special Duties network, and the most advanced and complex, and as such has high potential to inform our understanding of this less well-understood area of Second World War heritage. It appears to embody the ‘best practice’ developed for the construction of such stations between 1941 and 1944; * Documentation: due to the secret nature of the Auxiliary Unit organisations, very little documentation ever existed relating to it, and some information is thought to have been destroyed. However, a ‘super station’ is referred to in a contemporary private diary of the senior ATS officer, which most likely refers to this site; * Group value: the site is within a Grade I registered park linked to the seat of the Earl of Pembroke, Listed at Grade I. The importance of Wilton House as the location of Southern Command Headquarters during the Second World War is high, as probably the most vital centre of operations coordinating home defence and, subsequently the logistic preparations for the Normandy landings on 6th June 1944; * Representative: the station is of unique size and complexity, probably representing the key role of Wilton House in both the home defence network and the plans to invade occupied France in 1944.


The underground wireless station in Hare Warren Woods, Wilton was constructed in 1943/4 as part of a secret military organisation to operate in areas of Britain should they come under German occupation. With the increasing threat of a German invasion in the summer of 1940, the Prime Minister, Winston Churchill, directed that a covert Army unit called ‘GHQ Auxiliary Units’ was to be formed. This has sometimes become referred to as the ‘British Resistance Organisation’ or BRO. The Operational Branch of the unit trained and equipped civilians to carry out acts of sabotage behind enemy lines. A completely separate branch called ‘Special Duties’, to which this station belonged, trained civilian volunteers living in the most threatened coastal areas of Britain to act as ‘observers’ (spies) and report on German military activities from within occupied areas. Observers left their reports in ‘dead letter drops’, which were delivered by runners to hidden wireless stations, called ‘OUT-Stations’. Civilian operators would then transmit the reports to military manned ‘IN-Stations’ outside the occupied area. The wireless networks were set up by Royal Signals from the GHQ Auxiliary Units Signals. The IN-Stations were manned by specially selected signallers or by officers of the Auxiliary Territorial Service (ATS).

Many of these IN-Stations were sited near to the Division or Corps HQs responsible for the operations in that area, and reports were delivered to the nearby HQ by runner or telephone. Initially, IN-Stations worked from wooden huts near to the HQ which they served, but from 1941 onwards many were provided with concealed underground dugouts. These were equipped with rations, water, sanitation and power supplies so that if the Germans occupied the surrounding area, they could remain concealed and operate in isolation for up to 21 days. Considerable ingenuity was used to conceal the entrances via trap doors and locking mechanisms. Special ventilation systems were built to provide fresh air in the dugout and to disperse foul air, generator exhaust fumes or cooking smells while muffling the sounds of activity and the noise of the generators. Aerials were concealed in nearby trees and the feeder cables were hidden under the bark. If access was gained into the dugout by the enemy, a layer of security was provided by heavy concealed doors, which gave time for the crew to destroy sensitive material and hopefully escape via a special tunnel with a hidden exit.

Royal Signals set up 20 wireless networks, each with an IN-Station (sometimes called a Control or Zero Station) to collect the intelligence reports transmitted from the OUT-Stations, which in most cases were near to the coast. Initially, the wireless coverage was in Kent, Surrey and East Anglia but there was a steady expansion northwards up the east coast, eventually to Sutherland and Caithness. The networks also expanded westwards along the South Coast from Hampshire through Dorset, East Devon, Somerset and along the South Wales coast. The station at Hare Warren appears to have been operational in a hut from March 1942 or earlier and evidence suggests that Wilton was the only command HQ to eventually have underground facilities. Contemporary documents indicate that the dugout was constructed in late 1943 and early 1944, when the threat of invasion was extremely low although there was still the possibility of German airborne or seaborne raids, but only near the coast. A reference to a 'super station' by Senior Commander Beatrice Temple (ATS) in her diary, probably refers to the station at Hare Warren: it is approximately three times the size of any other known IN-Station and accommodated 8 or 9, rather than 3, operators.

This IN-Station is of particular significance as it was an ‘Inner Network’ Station (collecting intelligence via IN-Stations rather than directly from OUT-Stations) serving the headquarters of the Army Southern Command, which had requisitioned Wilton House for its HQ and was responsible for the coastline from Portsmouth westwards to Lands End, and along the Bristol Channel into Gloucestershire. Documentary evidence in the National Archives (WO199/1194 ) shows it had direct wireless links from IN-Stations at Blandford covering the Dorset coast and Winchester covering Hampshire, plus another link to Coleshill, which gave indirect access from IN-Stations covering Somerset and East Devon. Coleshill House was the headquarters of the Auxiliary Units. There was also an alternate route from these stations via the Blandford site to Wilton.

By July 1944, approximately 3,500 civilians had been trained and the wireless networks were operating with over 125 civilian-operated OUT-Stations (and 78 SUBOUT-Stations), most of which were concealed in dugouts or hidden behind dummy walls in houses, attics, sheds or other buildings. Special Royal Engineers teams were used for this secret work. There were c.30 IN-Stations, most of which were also linked to an ‘INNER Network’ which enabled the intelligence to be passed back to Army District or Command HQs. The Special Duties branch was closed down in July 1944 and orders were given that all equipment was to be removed from the stations, and the concealed dugout entry and exit shafts were to be capped off with concrete and covered with earth. By 18 September 1944, documents in the National Archive (WO199/1194) report that all IN and OUT stations had been dismantled and closed down and that all dugouts had been blocked off. Between July and September 1944, the main entrance at Hare Warren was sealed with a concrete slab and covered with earth to conceal the facility and prevent access to it. The structure, its constructional details, and its facilities were to remain a secret in case the special techniques were to be required at some point in the future.

In 2013, the Wilton Control Station remains intact with steel grilles fixed across the two entrances. One area of roof has collapsed, possibly through human intervention.


Principal elements The control station is located below ground, at varying depths. It was constructed by the Royal Engineers and comprises a main operational area subdivided into a living, sleeping, cooking, wireless operation, and generator areas. The living area is partitioned from an entrance corridor by a concealed heavy timber door and wall. An escape tunnel leads from the operations area to an escape hatch and to a further tunnel that to an area containing a water tank. The whole structure forms a secret concealed Second World War communications facility.

Description The station is constructed in a pit, approximately 3 to 4 metres deep, with a concrete slab. The principal structure is on an approximate north-south orientation, 10.3m long and 3m wide, with corrugated iron shelters forming the walls and roof, and standing on concrete plinths. The area is subdivided by block partitions, which also support the walls and roof. There are timber door lintels and architraves, and where they survive the doors are timber plank. The wireless operations area is the largest space within station and has three timber operating positions fitted to the west wall, partitioned with timber and asbestos board. Above the desks, cabling lighting, powering the wireless sets and aerial connections remains in situ. The cabling runs north to the generator and battery room and south to a small cooking area, partitioned off from the operations area. A concrete partition and timber door lead to the generator room to the north. At its west end is a concrete exhaust silencer with an attached exhaust pipe that connects with a flue pipe, which exits through the north wall of the station. The glazed pipe exits the ground to the north of the station and is visible above ground. To both sides of the exhaust silencer box are bolts in the floor that were used to fix down two petrol-driven 300 Watt generators for charging and lighting batteries.

In the south-east corner of the main operations area, behind a further concrete partition, there is the entrance to an escape tunnel. The tunnel is formed by a 1.06m diameter concrete pipe, 17m in length. It leads to an escape shaft constructed of concrete and brick and covered by a post-war steel grille at ground level. A further 1.06m diameter tunnel runs 5.1m at 90 degrees (south) from the escape shaft to a square chamber containing a steel tank and two air vents. The air vents suggest that Elsan chemical toilets may have been situated here.

In the south-west corner of the main operations area is a small partitioned cooking area with a timber desk. To the south of the cooking area is a sleeping area with an intact timber bunk with steel mesh base to the west wall; the east bunk is collapsed. The upper bunks have been removed, although battens for their support remain.. To the south, a concrete step up to a timber plank door leads to an accommodation or living space. The eastern part of this room is partitioned by a concealed door and wall, separating it from a corridor to the entrance. The concrete block-lined corridor leads east then south to the entrance lobby. Timber posts and beams support the block walls of the lobby, which is roofed by a thick reinforced concrete slab that was installed in July-September 1944. An opening has been cut in the slab to provide a new roof opening, which is lined with timber. Above the square opening is a post-war steel cowl grille.


Books and journals
Lampe, D, The Last Ditch, (1967, reprinted 2007)
Simak, E, Pye, A, Churchill's Secret Auxiliary Units in Norfolk and Suffolk, (2013)
Simak, Evelyn, Pye, Adrian, Churchill's "Most Secret" Special Duties Branch, (2014)
Warwicker, J, Churchill's Underground Army, (2008)
David Hunt, Aspects of Aux Units, 2013,


This monument is scheduled under the Ancient Monuments and Archaeological Areas Act 1979 as amended as it appears to the Secretary of State to be of national importance. This entry is a copy, the original is held by the Department for Digital, Culture, Media and Sport.

End of official listing

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