In 1983, an armed gang stole \xa326m in gold bars from a high-security depot near London\u2019s Heathrow Airport. Dubbed the crime of the century by the press, the heist changed the face Britain\u2019s criminal landscape and the life of one undercover Scotland Yard detective. Ian Brown tells what happened when he was sent out to recover the gold. Narrated by Sky News crime correspondent Martin Brunt.