A file about spy Harold Philby (known also as Kim Philby) from the exhibition 'MI5: Official Secrets' is pictured at the National Archives in London. Photo: Reuters
Avoid facial disguises, carry loose change and be ready to make split-second decisions: just some of the advice Britain’s domestic spy agency gave recruits tailing subjects nearly a century ago.
Complete with drawings detailing how best to tail the suspect, the country’s MI5 security services issued the World War II-era guide to “observation” work to officers unfamiliar with this key piece of spycraft.
