Britanniamania: Going Underground - S17.E55

When an undercover officer from the Met's Football Intelligence Unit (FIU) is found stabbed after a football game, Supt. Chandler and Ch. Insp. Morys from FIU send a Sun Hill team to infiltrate Britannia, the hooligan gang responsible, and investigate their leader, a former police sergeant named Julian ""The Nap"" Napper. DC Mickey Webb goes undercover as builder Mickey Malone with support from DS McAllister as his girlfriend and DC Riley and PC Quinnan as his workmates. Webb successfully makes contact with gang member Gary Hughes, and meets Napper when the gang travel 'up north' for a game.