In early 1944 – just months before the Allied landings in Normandy – a court case took place at the Central Criminal Court (Old Bailey) in London that seemed straight out of a bygone century: Scottish physical medium Helen Duncan was prosecuted under the ancient Witchcraft Act 1735 and sentenced to nine months in Holloway Prison. It was the last trial of its kind in British legal history. Yet behind the archaic charge lay a high-stakes conflict between WWII national security, intelligence agencies, and the phenomena of physical mediumship.
Who Was Helen Duncan?
Victoria Helen MacFarlane Duncan (born 25 November 1897 in Callander, Scotland) grew up in modest circumstances. As a child she reported visions and spirit sightings, met with a mixture of concern and fascination by those around her. Following her marriage to Henry Duncan, a carpenter injured in WWI, she supported a large family of six children.
During the 1920s and 1930s, Helen Duncan became one of Britain's best-known and most controversial physical mediums. In her séances inside a darkened trance cabinet, materialisations manifested: substance-like emanations (ectoplasm) forming figures that spoke with sitters. Her principal spirit guides were a child figure named "Peggy" and a tall man named "Albert".
The Portsmouth Séance and the Mystery of HMS Barham
The turning point in Helen Duncan's life occurred in November 1941 in the naval town of Portsmouth. During a séance, the spirit form of a young sailor appeared bearing a cap tally reading "HMS Barham". The figure declared that his ship had gone down.
In fact, the battleship HMS Barham had been torpedoed by German submarine U-331 in the Mediterranean on 25 November 1941, exploding violently with the loss of 861 sailors. To protect civilian morale and keep enemy intelligence unaware of the casualty rate, the British Admiralty kept the loss strictly secret. Families were notified only in late January 1942.
How Helen Duncan possessed specific details about the loss of HMS Barham months before official announcement deeply alarmed British security services. For believers, it was compelling proof of post-mortem survival; for MI5 officers, it raised urgent questions about security breaches or potential espionage amidst wartime preparation.
The Arrest and Old Bailey Trial (1944)
In January 1944 tension mounted as Great Britain prepared for Operation Overlord — the Normandy invasion. Any leak of military secrets could cost thousands of lives. On 19 January 1944, undercover police officers raided a séance conducted by Helen Duncan at the Master Temple Psychic Centre in Portsmouth. Attempts to grab the ectoplasm failed, and Duncan was taken into custody.
Initially charged under the Vagrancy Act 1824, authorities soon escalated the prosecution by invoking Section 4 of the Witchcraft Act 1735. This law did not punish genuine witchcraft, but rather the "pretending to exercise or use any kind of Witchcraft, Sorcery, Enchantment, or Conjuration" to deceive the public.
The trial lasted seven days, drawing widespread national attention. Numerous witnesses testified in Duncan's defence under oath, recounting astonishing materialisations and private facts no stranger could know. Defence counsel offered to hold a live séance in court before the jury, though the judge declined. Ultimately, Helen Duncan was convicted and sentenced to nine months' imprisonment.
Winston Churchill's Reaction: "Obsolete Tomfoolery"
The trial provoked astonishment even at the highest levels of government. Prime Minister Winston Churchill sent a famous personal minute to Home Secretary Herbert Morrison on 1 May 1944:
"Let me have a report on why the Witchcraft Act of 1735 was used in a modern court of law. What was the cost of this trial to the State, considering that the witness was already in custody under the Vagrancy Act? ... All this obsolete tomfoolery to the trial of a woman who was practicing mediumship!"
Churchill viewed invoking an 18th-century witch law as an absurd waste of state resources and an outdated anachronism in a modern legal system.
Scientific Debates, Ectoplasm, and Fraud Allegations
As with many historical cases of physical mediumship, Helen Duncan was subjected to intense examination by parapsychologists and sceptics alike. Noted researcher Harry Price tested her in 1931 at the National Laboratory of Psychical Research. He claimed that the ectoplasm appearing during Duncan's séances consisted of cheesecloth swallowed prior to the session and regurgitated in trance.
Supporters countered that Duncan was thoroughly searched before sessions, sewn into tight-fitting garments, and held by sitters. Furthermore, many witnesses insisted that the materialized entities were far too detailed and lifelike to be explained by simple cloth. The case reflects tensions explored further in our article on Mediumship and Power.
Legal Reform: The Fraudulent Mediums Act 1951
Public outrage surrounding the imprisonment of a mother of six under an 18th-century witch law catalyzed significant legal reform. After years of campaigning by bodies such as the Spiritualists' National Union, Parliament repealed the Witchcraft Act 1735 in 1951.
It was replaced by the Fraudulent Mediums Act 1951. This new legislation explicitly established that mediumship and spiritual practice were legal, provided there was no fraudulent intent for financial gain. For the first time, mediums in Great Britain gained formal legal protection — a milestone for the movement.
Helen Duncan's Legacy
Helen Duncan's health never fully recovered from her imprisonment. In November 1956, a séance in Nottingham was again disrupted by police; she passed away a few weeks later on 6 December 1956.
Today her name remains a symbol of the intersection between state authority, wartime secrecy, and spiritual belief. Relatives and supporters have campaigned for decades seeking a posthumous pardon from the Crown. Whether viewed through the lens of genuine physical phenomena or clever illusion, Helen Duncan's trial left an indelible mark on British legal history and British Spiritualism.
Sources: C.E. Bechhofer Roberts: The Trial of Helen Duncan (Jarrolds, 1945); Winston Churchill: Personal Minute to Home Secretary, 1 May 1944 (National Archives, Kew, PREM 5/142); Harry Price: Regurgitation and the Duncan Mediumship (1931); National Archives UK (Witchcraft Act 1735 & Fraudulent Mediums Act 1951).
Further reading: Explore our overview on Physical Mediumship and our analysis of Mediumship and Power.