Main •
Rhianne Barreto as Rani Rekowski, a straight-A student and serial shoplifter who struggles under the expectations and high standards of her strict and austere parents. •
Darren Boyd as John Halloran, a businessman and "right wing blow-hard" who struggles to impress his unloving father and keep his struggling business afloat. •
Gamba Cole as Ben Eastfield, a young nightclub security guard looking after his younger sister, who assumes the identity of Christian Taylor to carry out community service in his name. •
Jessica Gunning as Diane Pemberley, a former young offender, now acting as both a supervisor for community service, and later a
PCSO, with an inflated sense of authority. •
Clare Perkins as Myrna Okeke, an activist and "left wing militant" who frequently clashes with John, whilst struggling with guilt over the death of a police officer for which she was responsible. •
Eleanor Tomlinson as Lady Gabriella "Gabby" Penrose-Howe, an out-of-touch socialite,
reality TV star and social media influencer with anger management and substance abuse issues. •
Charles Babalola as Christian Taylor, the leader of the Brook Hill gang running the drug operation in Bristol for the Dean. • Aiyana Goodfellow as Esme Eastfield, Ben's sister. (series 1; recurring series 2) •
Ian McElhinney as John Halloran Snr., John's father. (series 1–2; recurring series 3) • Gyuri Sarossy as Jerzy Rekowski, Rani's father. (series 1–2) •
Nina Wadia as Shanthi Rekowski, Rani's mother. (series 1–2) •
Dolly Wells as Margaret, Frank's daughter. (series 1–2) •
Stephen Merchant as Greg Dillard, an unsuccessful and socially inept lawyer attempting to rebuild his love life following his divorce. •
Christopher Walken as Frank Sheldon, an American former conman living with his estranged daughter and grandchildren. (series 1–2; guest series 3) •
Claes Bang as Liam Matheson / The Dean, a London drug dealer overseeing the Brook Hill gang. (series 3; guest series 1; recurring series 2) • Tom Hanson as Spencer Fitzwilliam, Greg's sleazy and mean-spirited colleague who bullies him. (series 1–2; recurring series 3) • Grace Calder as DS Lucy Haines (series 2–3; recurring series 1) • Kojo Kamara as DS Selforth (series 2–3; recurring series 1)
Recurring •
Rhys Yates as Smiler (s1-3) •
James Nelson-Joyce as Aiden "Spider" Haswell, a drug dealer who works for Christian (series 1) • Guillermo Bedward as Tom, Frank's grandson (series 1–2) • Isla Gie as Holly, Frank's granddaughter (series 1–2) •
Rufus Wright as DCI Monroe, Haines and Selforth's superior (Series 1-3) •
Sam Troughton as Mr Wilder, Diane's superior (series 1) •
Richard E. Grant as the Earl of Gloucestershire, Gabby's aristocratic absentee father (guest series 1; recurring series 3) •
Gerard Horan as Graham Hilgard (series 1 and 3) •
Marcus Fraser as Souljah, a drug dealer who works for Christian. (recurring series 1; guest series 2) •
Alexandria Riley as Yvonne, Myrna's sister (series 1) •
Julia Davis as Rita (series 2)
Guest •
Michael Cochrane as Mr Kingsley, Greg's boss. (series 2) •
Elizabeth Dulau as Lesley (series 2) ==Episodes==