BELINDA: What’s your name? Doctor what?

DOCTOR: I’m just the Doctor.

BELINDA: You’re just the Doctor? You’re actually called the Doctor?

DOCTOR: Yep.

BELINDA: All right, I’m called the Nurse.

DOCTOR: Doctor and Nurse. Good team.

BELINDA: We had a doctor who insisted we call him “sir”. Next thing you know he’s got two of us pregnant and he’s struck off for leaving a scalpel inside a pensioner, so don’t think you’re impressive...

BELINDA: Do you mean it’s literally the same diploma? Like, in a time-travel way?

(The Doctor grinned at her.)

DOCTOR: Timey-wimey.

BELINDA: Timey-wimey?

DOCTOR: Yup.

(Belinda gave him the look of someone who had performed beyond expectations in her physics A-level.)

BELINDA: Am I six?