 Raison's breakthrough role was as Jo Portman (2005–2009) in the BBC One television drama series "Spooks" (also broadcast under the title "MI-5").She requested that the production company let her go in 2009 as she felt that her character could not develop further and wanted to follow up on theatre opportunities.In April 2007 she appeared in the "Doctor Who" episodes "Daleks in Manhattan" and "Evolution of the Daleks" as Tallulah, a show girl whose opening scene involved singing to a musical number, for which Raison's father played the piano background as part of the BBC National Orchestra of Wales.