Secrets, Spy Tools and a 110-Year-Old Lemon Are on Show in an Exhibition from Britain’s MI5  

01 April 2025, United Kingdom, Richmond: Guy Burgess' passport and briefcase are displayed during a preview of the MI5: Official Secrets exhibition at the National Archives in Kew. (Jonathan Brady/PA Wire/dpa)
01 April 2025, United Kingdom, Richmond: Guy Burgess' passport and briefcase are displayed during a preview of the MI5: Official Secrets exhibition at the National Archives in Kew. (Jonathan Brady/PA Wire/dpa)
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Secrets, Spy Tools and a 110-Year-Old Lemon Are on Show in an Exhibition from Britain’s MI5  

01 April 2025, United Kingdom, Richmond: Guy Burgess' passport and briefcase are displayed during a preview of the MI5: Official Secrets exhibition at the National Archives in Kew. (Jonathan Brady/PA Wire/dpa)
01 April 2025, United Kingdom, Richmond: Guy Burgess' passport and briefcase are displayed during a preview of the MI5: Official Secrets exhibition at the National Archives in Kew. (Jonathan Brady/PA Wire/dpa)

A desiccated 110-year-old lemon that played a key role in espionage history is one of the star attractions of a London exhibition drawn from the files of MI5, Britain’s domestic intelligence agency.

Compact spy cameras, microdots in a talcum powder tin and a briefcase abandoned by fleeing Soviet spy Guy Burgess are also part of the show at Britain’s National Archives, which charts the history of a secretive agency that is – slowly – becoming more open.

MI5 Director General Ken McCallum told journalists at a preview on Tuesday that the organization’s work “is often different from fiction, whether that fiction is George Smiley or Jackson Lamb” – the brilliant spymaster of John le Carré's novels and the slovenly supervisor of MI5 rejects in Mick Herron’s “Slow Horses” series.

Many stories told in the exhibition, however, would not be out of place in a thriller.

The lemon, now black and shriveled, helped convict Karl Muller, a German spy in Britain during World War I. It was found by police in his bedside table, along with another in his overcoat pocket. Evidence at his secret trial showed their juice had been used to write invisible-ink letters detailing British troop movements.

Muller was executed by firing squad at the Tower of London in 1915.

In a coda that would not be out of place in “Slow Horses,” MI5 pretended Muller was still alive and wrote to his German handlers to ask for more money.

“The Germans duly sent more funds and MI5 used the funds to purchase a car,” exhibition curator Mark Dunton said. “And they christened the car ‘The Muller.’

“They then were reprimanded by the Treasury for unauthorized use of expenditure,” he added.

The show includes declassified records held by the National Archives and items loaned from the secret museum inside Thames House, MI5’s London headquarters.

It charts the changing role of an agency that was founded in 1909 as the Secret Service Bureau with an initial staff of two officers.

There are records of its World War II successes, when the agency used captured Nazi agents to send disinformation back to Germany, deceiving Adolf Hitler about the location of the looming Allied invasion in 1944.

Failures include the years-long betrayal of the upper-crust “Cambridge Spies,” whose members spilled secrets to the Soviet Union from the heart of the UK intelligence establishment. Recently declassified MI5 documents on display include the 1963 confession of Cambridge spy Kim Philby, who denied treachery for years before he was exposed and fled to Moscow.

The exhibition also reveals changing attitudes, not least to women. The exhibition includes a 1945 report by spymaster Maxwell Knight discussing whether women could make good agents.

“It is frequently alleged that women are less discreet than men,” he noted, but declared that it was not so, saying that in “hundreds of cases of ‘loose talk’” most of the offenders were men.

There are admissions of past mistakes. The exhibition notes that MI5 was slow to recognize the threat from fascism in the 1930s, and later spent too much time spying on the small Communist Party of Great Britain. MI5 didn’t need to break into the party’s offices – it had a key, which is on display.

There are only a few items from the past few decades, showing how MI5’s focus has shifted from counterespionage to counterterrorism. Displays include a mortar shell fired by the Irish Republican Army at 10 Downing St. in 1991 while Prime Minister John Major was holding a Cabinet meeting.

MI5 only began releasing records to the UK’s public archives in 1997, generally 50 years after the events have passed. Even now, it controls what to release and what to keep secret.

“It would be a mistake to assume everything is in the exhibition,” said author Ben Macintyre, whose books on the history of intelligence include “Operation Mincemeat” and “Agent Zigzag.” But he said it still marks “a real sea-change in official secrecy.”

“A generation ago, this stuff was totally secret,” he said. “We weren’t even allowed to know that MI5 existed.”



Nepal Capital Chokes as Wildfires Rage

Swoyambhunath Stupa on a hilltop is barely seen from a Skywalk tower amid the air pollution in Kathmandu, Nepal April 3, 2025. REUTERS/Navesh Chitraker
Swoyambhunath Stupa on a hilltop is barely seen from a Skywalk tower amid the air pollution in Kathmandu, Nepal April 3, 2025. REUTERS/Navesh Chitraker
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Nepal Capital Chokes as Wildfires Rage

Swoyambhunath Stupa on a hilltop is barely seen from a Skywalk tower amid the air pollution in Kathmandu, Nepal April 3, 2025. REUTERS/Navesh Chitraker
Swoyambhunath Stupa on a hilltop is barely seen from a Skywalk tower amid the air pollution in Kathmandu, Nepal April 3, 2025. REUTERS/Navesh Chitraker

Nepal's capital was blanketed in acrid smog Thursday as wildfires across the country pushed air pollution levels to among the worst in the world.

Experts say that widespread wildfires, fueled by an exceptionally dry winter and stagnant atmospheric conditions, have caused the thick and throat-burning smog to cover the Kathmandu valley, AFP reported.

Levels of PM2.5 pollutants -- cancer-causing microparticles that enter the bloodstream through the lungs -- registered above 178 micrograms per cubic meter on Thursday, according to Swiss monitoring firm IQAir.

A reading above 15 in a 24-hour period is considered unhealthy by the World Health Organization (WHO), and IQAir ranked Kathmandu the world's most polluted city.

The Himalayan nation sees a spate of wildfires annually, usually beginning in March, but their number and intensity have worsened in recent years, with climate change leading to drier winters.

"The prevailing dry conditions have significantly increased the frequency of forest fires across the country, further worsening air pollution," Khushboo Sharma, an air pollution analyst at the Kathmandu-based International Centre for Integrated Mountain Development(ICIMOD) told AFP.

"This year, precipitation was exceptionally low, with hardly any rainfall, leaving forests dry and more susceptible to fire," she added.

Sharma said that stagnant meteorological conditions are also causing pollution to accumulate over the valley.

On social media, people complained of stinging eyes and itchiness because of the pollution.

Low visibility caused by the smog also disrupted flights at Kathmandu airport, sparking long delays.

"The mountain flights... as well as some other flights have been disturbed because of the pollution," said Rinji Sherpa, the airport's spokesman.

The health ministry issued a notice Wednesday requesting Nepalis to "avoid unnecessary travel" and to wear a mask when outside.

The government has also urged people to avoid construction and burning rubbish.

The Air Quality Life Index, issued by the University of Chicago, estimated that in 2024 air pollution stripped 3.4 years off the life of an average Nepal resident.