Just what you need to start a coup? How MI5 plotted to use radio-controlled bomber pigeons
Rediscovered post-war diaries have shown that British spy-masters considered developing remote-controlled homing pigeons - perhaps to carry explosives.
Details of the scheme have emerged in the post-war diaries of Guy Liddell, then-deputy director general of MI5.
It seems the idea was discussed with Captain James Caiger, who ran the Army's pigeon loft after the war.
Liddell's diaries show that the Joint Intelligence Committee heard a presentation from Caiger, the army's pigeon expert.
He informed them that the homing instinct of the birds could be used to trick them into following a radio beam.
In an entry for October 3, 1946, Liddell described how Capt Caiger came to see him. "He is our pigeon expert. He is, in fact, the nearest thing to a pigeon that I have ever seen. He talks, thinks and dreams about them," he wrote.
"He has had pigeons since he was a boy and his father had pigeons before him.
"I asked him about the homing instinct. He said that the matter is quite unsolved.
"There is however, one curious fact, namely that in a sun spot year all pigeons go hay-wire.
"Sun spots are, of course, minute radio active particles thought how they affect the pigeons' homing instinct nobody knows.
"This gives some colour to the suggestion that pigeons might be able to home on an electric beam, in other words that you might have radio-controlled pigeons."
MI5 files previously released refer to plans to train pigeons to carry explosives and fly into enemy searchlights.
It was not until 2007, however, that scientists were able to perfect plans similiar to those mooted by Liddell.
Scientists at a University in China implanted microchips which plotted the birds' course by sending electronic impulse signals.
The diaries, released to the National Archives in Kew, make reference to a number of 'spycraft' ideas.
In February 1949 Liddell discussed impregnating papers with radioactive substances to set off an alarm if they were removed from a building.
Liddell wrote that he was told: "it is quite possible to impregnate paper, metal clips or ink with radioactive substance and to install either under the floor boards or in a door post, or under the ground outside an apparatus which will register if anybody goes out of the building with a secret paper so impregnated."
But snags would include health risks to anyone if the papers were left in a drawer, he noted:
"It would at the outset produce extreme lassitude and later a loss of blood counts.
"No serious harm would result if the papers were removed and the symptoms detected. To counter these ill-effects it would be possible to introduce some self-destroying material."
- 1 President of Argentina adopts Jewish godson to 'stop him turning into a werewolf'
- 2 ALS ice bucket challenge co-founder Corey Griffin drowns, aged 27
- 3 Stoke-on-Trent becomes first British city to be classified as 'disaster resilient' by the United Nations
- 4 Sir Winston Churchill’s family begged him not to convert to Islam, letter reveals
- 5 AirAsia flight QZ8501 missing: Search for plane carrying 162 passengers from Indonesia to Singapore suspended overnight
President of Argentina adopts Jewish godson to 'stop him turning into a werewolf'
Exclusive: Abusers using spyware apps to monitor partners reaches 'epidemic proportions'
UK weather: Warning for more snow and ice as freezing temperatures and gales hit Britain
Stoke-on-Trent becomes first British city to be classified as 'disaster resilient' by the United Nations
AirAsia flight QZ8501 missing: Search for plane carrying 162 passengers from Indonesia to Singapore suspended overnight
British actor Idris Elba cannot star as James Bond because he is black, says shock jock Rush Limbaugh
Millions of Britons struggling to feed themselves and facing malnourishment
Ukip member gets into Christmas spirit with Union Flag plea to Santa 'for our country back'
Germany anti-Islam protests: 17,000 march on Dresden against 'Islamification of the West'
Nigel Farage: Ukip leader named 'Briton of the year' by The Times
Immigrants make UK racist, says Ukip councillor Trevor Shonk
£32000 - £40000 per annum: Recruitment Genius: A Business Manager is required ...
£45000 - £55000 per annum: Recruitment Genius: This is an exciting opportunity...
£20000 per annum: Recruitment Genius: Panel Wireman required for small electro...
£25000 - £27000 per annum: Recruitment Genius: An SME based in East Cheshire, ...