The National Archives is set to release more than 150 secret spy files on individuals and organisations involved in spying during the First World War.
Photos, letters and interrogation reports are among the documents to be released online by the Archives. They contain details about spies operating across the globe, including the notorious female spy Mata Hari and Swallows and Amazons author Arthur Ransome.
More top news
Europe's biggest street festival kicks off in Notting Hill for what promises to be another fun-filled weekend in west London
A woman from north London has been found guilty of causing death by careless driving after hitting two-year-old girl in a car park.
A 23-year-old man who was beaten up inside a cab in Farringdon is fighting for his life in hospital in a critical condition.