001-003: Officer Yates (Kirsty Child)
005-294: Officer Grahame (Susan Arnold)
295-481: Officer Barfield (Delva Hunter)
482-692: Officer Brown (Geraldine Girvan)
Only at a few times the lock-up round was replaced with other background scenes during the credit sequence as follows:
004: Lock-up sequence was replaced with sad Meg walking through the corridors.
006: Lock-up sequence was replaced with drunk Lizzie falling asleep in her bed.
127: Lock-up sequence was replaced with the fence of Andrew Reynolds' factory as background to the credits.
139: Lock-up sequence was replaced with Doreen in hospital bed after her suicide attempt.
191: Lock-up sequence was replaced with Bea crying in her cell after Ken Pearce's departure.
224: Lock-up sequence was replaced with Vera leaving Wentworth for the last time.
239: Lock-up sequence was replaced with Lizzie setting Sid Humphrey's house on fire.