LONDON, Jan. 20 -- 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.
From "picking up the suspect" and "following in the street" to "in a restaurant" and "travelling by train", this how-to even features guidance when the subject entered the post office - deemed "excellent opportunities for investigation".
The booklet is among various newly-declassified records set to go on display in a gr...