Gotcha!

On Easter Monday 1983 armed robbers got into the supposedly impregnable Security Express depot in Shoreditch, neatly capturing the guards and holding them hostage. They hauled away 5 tons of cash, worth £6 million then (£26 million in today's currency). The gang made no mistakes and left behind not a single clue.

Det. Supt Peter Wilton was the man in...