There's a lot of context that goes into this question. Almost all grown-ups understand time zones at least enough to know that somewhere far away (at the other side of the equator or longitudinally) is likely to have a different time of day at any given time. On the flip side, we understand that somewhere sufficiently close, like the next town over, is at least in general unlikely to have a different time of day. So for an intelligence (artificial or otherwise) to choose between London, a few kilometres away, and London, UK, would depend on at least these factors:
- How important is either London in your life? If you commute to London, Canada, then it's going to be infuriating to always get answers about London, UK.
- Is the answer for London, Canada different from "What time is it?"? If it's the same, then there's at least a fairly good chance that you knew it was in the same time zone, and you didn't intend to ask about it.
- Asking about the time is fundamentally different from asking about a whole lot of different things. Let's say you ask for the biggest manga book shop in London, which London depends on whether you're currently near any London, whether you've been to any specific London before, whether you've got tickets to go to a conference in London, whether London near you is even big enough to have a manga book shop.
All in all, no, it's not obvious that "London" always means the globally most important London.
Even us folks who live in Ontario refer to London in Canada as "London Ontario" when talking about it, unless it's extremely contextually obvious that you _don't_ mean London, UK.
So yes, it is obvious to us humans who have London Ontario in our lives that "London" refers to London UK.
I'm pretty sure there are plenty of people living close to London Ontario who refer to it as simply "London", but that's besides the point. We are nowhere near being able to algorithmically take into account everything every single person considers "obvious" in AI. Software today, whether it's marketed as "AI", "expert system" or other IMO bullshit term, is absolutely nowhere near what a non-developer, non-marketing person would describe as such.
- How important is either London in your life? If you commute to London, Canada, then it's going to be infuriating to always get answers about London, UK.
- Is the answer for London, Canada different from "What time is it?"? If it's the same, then there's at least a fairly good chance that you knew it was in the same time zone, and you didn't intend to ask about it.
- Asking about the time is fundamentally different from asking about a whole lot of different things. Let's say you ask for the biggest manga book shop in London, which London depends on whether you're currently near any London, whether you've been to any specific London before, whether you've got tickets to go to a conference in London, whether London near you is even big enough to have a manga book shop.
All in all, no, it's not obvious that "London" always means the globally most important London.