Billy: Drink? You, me? Now?
Sally: Aren't you on duty, Detective Inspector Shipton?
Billy: No. Knocked off before I left. Told them I had a family crisis.
Billy: Because life is short and you are hot. Drink?
Billy: Phone number?
Sally: Moving very fast, DI Shipton.
Billy: Billy. I'm off duty.
Sally: Aren't you just?
(Sally writes her phone number on a piece of paper)
Billy: Is that your phone number?
Sally: Just my phone number. Not a promise. Not a guarantee. Not an IOU. Just a phone number.
Billy: And that's Sally…?
Sally: Sally Shipton. (realises what she's said; embarrassed) Sparrow! Sally Sparrow!