Many episodes in the first seven series featured either Chisholm and Jones or Rycott and Mellish, and the two pairs sometimes appeared together, emphasising the professional rivalry between them, much to the annoyance of their superior officer, Detective (Chief) Inspector Norton (Tony Caunter). This rivalry reached fever pitch in the episode "Around the Corner" (which closed Series 5) when all four officers, in two cars, crashed head-on while attempting to arrest Arthur and Terry. DI Norton's subsequent comments were scathing. Although Norton's appearances were always brief, they demonstrated the personal nature of Chisholm's and Rycott's campaigns. In the Series 6 episode "From Fulham with Love" Norton appears for less than a minute, but spends that entire appearance denouncing Chisholm for his "personal vendetta against Arthur Daley".