The Bill - Season 16 Episode 17 Nightwork

Worell goes undercover as a prostitute on Barrack Lane after a series of punters are assaulted and robbed, the most recent of which resulted in the punter being sliced across the face with a knife. Worrell gets close to Leanne Gibbs, a former tom who is recently back on the game after quitting rehab. Ackland, however, has a troubled past with Leanne, and resents CID using her again for an undercover operation. Ackland finds herself in too deep and nearly blows Worrell's cover, which agonizes Stanton and Meadows.