TNia Miller as Simone Thearle, Mayor of LondonNasir Afridi successfully campaigned to become the Mayor of London in series one, but thanks to the vengeful Lale and her razorblade, his time in office was even shorter than that of Liz Truss. Perhaps new mayor Simone Thearle will have better luck? Shes played by TNia Miller, a stage and screen actor who gave an acclaimed performance in Mike Flanagans The Haunting of Bly Manor on Netflix, and returned for his The Fall of the House of Usher. Miller has had a fruitful working relationship with Doctor Who showrunner Russell T Davies, and played roles in his dramas Banana, Cucumber, and Years and Years, as well as appearing in Apple TV+ sci-fi Foundation and The Peripheral.Andrew Koji as ZeekZeek is a mysterious hitman who turns out to have an intimate and tragic connection to one of series threes main players. Hes played by Andrew Koji, a former stunt man and martial artist-turned-actor, who is best recognised for his central role as Ah Sahm in Cinemaxs Warrior. Koji has also starred alongside Brad Pitt in Bullet Train, in action movie Snake Eyes, played Brilliant Chang in Peaky Blinders, Basho in Boy Kills World, and Jason in Netflix assassin thriller Black Doves.Phil Daniels as Ronnie DevereuxPhil Daniels joins Gangs of London series three fresh from the role of Maester Gerardys in HBOs House of the Dragon. Since making his name in 1979 cult feature film Quadrophenia, Daniels has patchworked together a great career of character parts, from movies to television, including a long stint as Kevin Wicks in BBC Ones EastEnders, supporting parts in Channel 4s Adult Material and Skys I Hate Suzie, and a guest role in BBC Twos Inside No. 9.Ruth Sheen as Deborah DevereuxAlongside Daniels will be Ruth Sheen in the role of Deborah Devereux. Sheen is a familiar face on British television, with recent roles in BBC One crime drama Strike and Sky fantasy series The Nevers, along with ITVs Prime Suspect: 1973 and Unforgotten, following on from older parts in the likes of Cracker, Bramwell, The Bill, Accused, Misfits, and Mike Leighs Mr Turner.Janet McTeer as Isobel VaughnOzark and KAOS Janet McTeer, whos rumoured to be playing Professor Minerva McGonagall in the new Harry Potter TV series, appears in Gangs of London series three as the mysterious Isobel Vaughn.RETURNING CHARACTERSSope Dirisu is back as Elliot Carter, a former undercover police officer whos now a drug-running gang leader. Joe Cole returns as the incarcerated Sean Wallace, with Michelle Fairley as his mother Marian, and Brian Vernel as his brother Billy. Lucian Msamati and Pippa Bennett-Warner are back as Ed and Shannon Dumani.