Behind the bright lights and bustling streets, Britain's cities are also home to some of the country's biggest criminals.
Britain's Underworld delves deep into the dark criminal underbelly of the UK.
Despite the best efforts of politicians, judges and the police, the war on crime is still raging.
With every generation throwing up a new batch of blaggers, gangsters, drug smugglers and violent, ruthless thugs, join us into the shadows to meet the men determined to make crime pay and the police force dedicated to stop them.
Friday 20 March at 8:00PM - National Geographic Channel
Friday 13 March at 8:00PM - National Geographic Channel
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