You may be on to something…
It all makes sense now…
Not to mention her high affinity to Britain. But seriously guys, Eleven’s already addressed this before lol It was on a Christmas special:
The Doctor: Right then! Your bedroom. Great. Let’s see, you’re twelve years old so we’ll stay away from under the bed. Cupboard! Big cupboard! I love a cupboard. Do you know, there’s a thing called a phase spider—it’s just like a tiny baby ‘cept with spider legs. And it specifically evolved to scuttle on the backs of bedroom cupboards. closes cupboard. Which, yeah, I probably shouldn’t have mentioned. Right. So. What are we going to do? Eat crisps and talk about girls? I’ve never actually done that but I bet it’s easy. Girls. Yeah?
Kazran: Are you really a babysitter?
The Doctor pulling out the psychic paper: I think you’ll find that I’m universally recognized as a mature and responsible adult.
Kazran: It’s… just a lot of wavy lines.
The Doctor: Yeah. Shorted out. Finally, a lie too big. Okay. Not really a babysitter but it’s Christmas Eve. You don’t want a real one. You want me.
Kazran: Why? What’s so special about you?
The Doctor: Have you ever seen Mary Poppins?
The Doctor: Good. ‘Cause that comparison would’ve been rubbish.