SPECIAL INVESTIGATION: The secret signs a pub thief is about to steal your bag: Mail joins undercover police team - and returned laptops to drinkers BEFORE they even realised they'd been robbed!
HARRY WALLOP joins a special police team catching bag thieves in action as they prey on office workers in the City of London.
HARRY WALLOP joins a special police team catching bag thieves in action as they prey on office workers in the City of London.
