EVELYN: What are you up to that's made you skip breakfast?

DOCTOR: Hmm? Oh er, just a few systems upgrades. Certain functions have been neglected over the years, disconnected. Thought I'd take the time to do a little, oh, housekeeping.

EVELYN: That's not like you. You'll do anything to put off doing repairs. Out with it. What aren't you telling me?

DOCTOR: Well, there are some functions that were included in all Tardises from the Type Zero onwards, at the command of Rassilon himself.

EVELYN: And you've suddenly discovered the need for one of those systems.