Herbert Skinner Supervised Klaus Fuchs and Bruno Pontecorvo at Harwell
By Roy Castellano ·
A physicist's wife slept with a Soviet spy while her husband oversaw the security of Britain's nuclear program, creating a web of intimacy that drew the attention of the Security Service.
A husband’s professional trust and a wife’s secret affair created a vulnerability at the heart of Britain's atomic program. While Herbert Skinner managed the men building the bomb, his wife was sleeping with one of them—a man secretly serving the Soviet Union.
Herbert Wakefield Banks Skinner was a man of the establishment, a British physicist whose career placed him at the intersection of the most sensitive military secrets of the mid-century. Public records show he worked on radar at the Telecommunications Research Establishment and served on the Manhattan Project at the Berkeley Radiation Laboratory. By the time he reached the Atomic Energy Research Establishment at Harwell, he had ascended to the role of Deputy Director, serving under Sir John Cockcroft.
In this capacity, Skinner was not merely a colleague to the scientists tasked with harnessing nuclear energy; he was their superior. Specifically, he oversaw two men who would become central figures in the Cold War's great intelligence betrayals: Klaus Fuchs and Bruno Pontecorvo.
Bristol and Harwell
The file's catalogue entry from The National Archives records that Skinner's professional relationship with Klaus Fuchs began earlier, at Bristol. By the time they were both at Harwell, the relationship had expanded beyond the laboratory. Skinner and his wife, Erna, were described in the catalogue description as being "close friends" of both Fuchs and Pontecorvo.
In the rigid hierarchies of the British scientific community during the 1940s and 50s, such social intimacy was common among the elite. However, the catalogue entry notes a complication that transcended mere friendship: Erna Skinner was Fuchs' mistress.
For a man in Skinner's position—the Deputy Director of a site of immense strategic importance—the overlap of domestic intimacy and professional supervision is a textbook security risk. The Security Service, however, viewed the arrangement through a different lens. The catalogue entry states that an investigation into the matter "showed nothing significantly adverse in a security context."
Abrahamson, Wurmbrand
The record does not just track the physicist; it tracks his wife. Erna Skinner is identified as Austrian/British, a dual identity that often triggered scrutiny during the height of the Red Scare. The catalogue entry lists two aliases associated with her: "ABRAHAMSON" and "WURMBRAND."
The use of aliases suggests a layer of complexity to Erna's background or her movements that the brief catalogue summary does not fully explain. Whether these names were used for convenience, evasion, or as part of a broader pattern of behavior is not detailed in the description. What remains is the fact that the Security Service felt the need to record them alongside her primary identity.
That Erna Skinner shared a bed with Klaus Fuchs—a man who was systematically passing nuclear secrets to the Soviet Union—while her husband managed his workload and security clearances is a detail that should have suggested a catastrophic breach. It places the Skinner household not as a target of espionage, but as a social node through which the most dangerous man at Harwell could navigate the upper echelons of the project.
"Nothing significantly adverse"
The phrase "nothing significantly adverse in a security context" is the most striking part of the catalogue entry. It represents a formal conclusion by the Security Service that the social and sexual entanglement between the Deputy Director's wife and a Soviet asset did not constitute a threat.
This verdict raises a question about the blind spots of the era's counter-intelligence. If the Security Service knew of the affair and the closeness of the circle, they were either convinced that Erna Skinner was not a conduit for Fuchs’ espionage, or they fundamentally underestimated the leverage such a relationship provided. In the world of intelligence, a mistress is rarely just a mistress; she is a potential source of information or a point of pressure.
Yet, the record indicates that the investigation closed without a red flag. The personal lives of the Skinners and the spies they befriended were treated as a domestic eccentricity rather than a security failure.
The National Archives holds further information on this circle, including related files KV 2/2080 and KV 2/2081, which also list Professor Herbert Wakefield Banks Skinner and Erna Skinner under the same aliases. The catalogue for KV 2/2082 leaves it unclear whether the "nothing significantly adverse" conclusion remained the official stance after Fuchs' eventual exposure and confession.