<p>By the 1980s, Georgie Pai has been arrested in Glastonbury for overstaying a tourist visa, found guilty of terrorising Chinese communities in Southampton, and deported back to Hong Kong. But borders are no barrier for a man with the right connections. He slips back into Britain and continues to expand his empire.</p><p>Manchester becomes his nerve centre as police begin building a database of suspected Triad gangsters. But with Wo Shing Wo’s growing power comes a rising tide of violence. One of Georgie Pai’s associates is brutally attacked with machetes, a warning that it is far from an isolated incident. Across the UK, violent clashes between rival Triad factions are becoming alarmingly common, each gang carving up territory in a bloody, escalating turf war.</p><p>Presenter: Livvy Haydock Series Producer: Hayley Mortimer Technical Producer: Richard Hannaford Producers: Patrick Kiteley &amp; Matt Toulson Fixer in Hong Kong: Michelle Chan Music: Andy Simms and Reliable Source Music Journalism Assistants: Hattie Valentine &amp; Ellie Dover Commissioning Producer: Sam Proffitt  Commissioning Executive: Lorraine Okuefuna and Louise Kattenhorn Commissioning Editor: Richard Maddock Editor and Executive Producer: Clare Fordham</p>