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Ministry of Supply Valley Site is a post-medieval and modern ordnance factory located in Wales, protected by Cadw as monument FL210. The factory represents twentieth-century industrial heritage, reflecting Britain's investment in munitions production during periods of national defence. Built upon bedrock of the Millstone Grit Group, the site occupies geology typical of upland Wales, where coarse sandstones, siltstones and mudstones of Namurian age provide a stable foundation suited to heavy industrial development.
The valley location offered practical advantages for ordnance manufacture, including access to water and natural topography that could shelter the facility. The Millstone Grit Group bedrock, formed during the Carboniferous period, consists of robust sedimentary rocks capable of supporting substantial industrial structures and machinery. This geological stability would have been important for the precision engineering required in weapons production.
The site preserves evidence of twentieth-century munitions manufacturing, a significant chapter in Wales's industrial history. Its protection by Cadw recognises the importance of ordnance factories as heritage monuments that document Britain's wartime and peacetime military-industrial capacity. The Ministry of Supply Valley Site remains a tangible record of industrial effort and technological development in the modern period.
Ministry of Supply Valley Site is a scheduled monument protected by Cadw under reference FL210. View the official record →
Ministry of Supply Valley Site is a post-medieval and modern ordnance factory located in Wales, protected by Cadw as monument FL210. It is designated a Scheduled Ancient Monument by Cadw under reference FL210.
Ministry of Supply Valley Site dates from the post medieval/modern period, and is classified as a ordnance factory. It is one of over 32,000 scheduled monuments protected across the UK.
Ministry of Supply Valley Site 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 FL210.
Several scheduled monuments lie within 10 km, including Round Barrow at Pentrehobin (5.1 km), Coed Clwyd Cairns (6.7 km), Moel-y-Gaer Camp (7.3 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Ministry of Supply Valley Site's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Ministry of Supply Valley Site stands on Millstone Grit Group [See Also Migr], bedrock that formed in the Namurian. The rock here is mudstone, siltstone and sandstone.