Paterson Joseph (born 22 June 1964) is a British actor. He appeared in the Royal Shakespeare Company productions of King Lear and Love's Labour's Lost in 1990. On television he is known for his roles in Casualty (1997-1998), as Alan Johnson in Channel 4 sitcom Peep Show (2003-2012), Green Wing (2004-2006), Survivors (2008-2010), Boy Meets Girl (2009) and as DI Wes Layton in Law & Order: UK (2013-2014). His film roles include The Beach (2000), Æon Flux (2005) and The Other Man (2008).