The final episode of the Brighton series was "A Fixed Address", broadcast (in monochrome) on 10 September 1969—although it was actually made in colour, as noted above. The series afforded a great deal of character development to secondary characters. Mrs Mortimer's estranged husband turns up on her doorstep claiming that he wants to restart their relationship. It transpires that his employers have offered him a lucrative post in an exotic overseas location—but only if he is a married man accompanied by his wife. The episode is notable for Marker setting up on his own again as an enquiry agent. The end credits are played over shots of him admiring his new (but still run-down and dingy) office. The end credits returned to the original theme music of previous series rather than the barer, more static arrangement that had been used especially for the Brighton episodes.