British State Expanded 7,000-Acre Biological Weapons Site

By Eleanor Voss · August 10, 2026

Hidden within the Wiltshire countryside, the state increased its biological warfare capacity through secret hiring and new laboratory construction.

The catalogue entry for Overseas Memorandum Number 84 of 1948 describes a report by the Biological Warfare Sub-Committee. According to the archive's descriptive text, the document focuses on two primary objectives: the "Recruitment of Scientific Staff" and the "Construction of New Laboratories" at the Microbiological Research Department in Porton.

This file, listed under catalogue reference DEFE 5/10/84, is situated within the records of the Ministry of Defence’s Chiefs of Staff Committee. It belongs to the (O) Series of memoranda, a collection where items are described at the individual level. Because this is a catalogue description and not the memorandum itself, the specific names of the recruits or the blueprints for the new laboratories are not available. However, the pairing of recruitment and construction in a single report indicates a period of institutional scaling.

Staffing the Labs

In 1948, the British state was navigating the early tensions of the Cold War, a period when the capabilities of biological agents were being weighed against the strategic needs of national defense. The file's catalogue entry records that the Biological Warfare Sub-Committee was tasked with identifying the human capital necessary to sustain this research.

For a physicist, the mention of "scientific staff" is a broad term that masks a complex variety of specialties. Biological warfare research in the late 1940s required more than just microbiologists; it necessitated expertise in aerosol physics, climatology, and metallurgy to understand how pathogens could be weaponized and dispersed. The report by the Sub-Committee suggests a formal effort to professionalize and expand the workforce at Porton, moving beyond the exigencies of the Second World War and into a permanent state of readiness.

7,000 Acres in Wiltshire

These activities took place at Porton Down, a science and defence technology campus in Wiltshire, England. Public records describe the site as home to the Ministry of Defence's Defence Science and Technology Laboratory (DSTL), a facility known for over a century as one of the UK's most secretive and controversial military research sites.

Occupying 7,000 acres, the campus provides the isolation necessary for high-risk experimentation. The catalogue's reference to the "Construction of New Laboratories" suggests that by 1948, the existing facilities at the Microbiological Research Department were insufficient for the Sub-Committee's ambitions. The physical expansion of the site mirrored the expansion of the mission. In a landscape as vast as Porton Down, the addition of new laboratories could be hidden from the surrounding villages, including the village of Porton, while facilitating the dangerous work of biological research.

DEFE 7/2100

Memorandum 84 does not exist in isolation. The National Archives hold a wider array of files under the DEFE series that paint a picture of a sustained, multi-decade commitment to these weapons. Related catalogue entries show a consistent focus on the intersection of biology and chemistry in warfare.

File DEFE 13/287 is described as covering "Biological warfare: research and development" within the Minister's Office. Similarly, DEFE 7/2100 records the activities of the Defence Research Policy Committee regarding biological warfare, and DEFE 7/1964 details the work of the Defence Research Policy Staff on the same subject. Another entry, DEFE 23/293, specifically groups "biological and chemical warfare" under the registered files of the Permanent Under Secretary of State for Defence.

The repetition of these titles across the archives suggests a highly structured administrative pipeline. The recruitment and construction goals outlined in Memorandum 84 were the foundational steps—the hiring of the people and the building of the rooms—that allowed the research and development described in later files like DEFE 7/2184 to proceed.

While the public record now acknowledges that Porton Down also houses the UK Health Security Agency and the Porton Science Park, the 1948 memorandum belongs to a different era of the site's history. It represents a moment when the Biological Warfare Sub-Committee was actively defining the technical and physical boundaries of the UK's biological capabilities.

The catalogue lists these documents under the "O" Series of the Chiefs of Staff Committee. Whether the recruitment goals of 1948 were fully met, or which specific laboratories were ultimately constructed, remains a gap in the descriptive record.