It’s in Ireland
INTERN: You are a doctor yourself?
FOURTH DOCTOR: Well, sort of, yes.
INTERN: How do you do? Tell me, where did you qualify, if I may ask?
FOURTH DOCTOR: A place called Gallifrey.
INTERN: Gallifrey? No, I’ve not heard of it. Perhaps it’s in Ireland.
FOURTH DOCTOR: Probably.
— The Hand of Fear
WOMAN: Patient’s name?
LEELA: Uh, just the Doctor.
WOMAN: Place of origin?
LEELA: Oh, I expect so.
— The Invisible Enemy
JOAN REDFERN: Where did you learn to draw?
JOHN SMITH/TENTH DOCTOR: Gallifrey.
JOAN REDFERN: Is that in Ireland?
JOHN SMITH/TENTH DOCTOR: Yes, it must be, yes.
— Human Nature