Heather nodded when he replied. "London School of Economics. So we probably won't be able to go inside, being Christmas eve, but nothing would stop us from walking around either, I don't think." Or anyone. Surely any cops would have some compassion today of all days.
She looked up at him at his question, sliding her phone into her pocket, then tucking her frozen little fingers in to the crook of his arm with the other hand. "Oh, I know it's not the one I know. Don't ask me how I know, please." She didn't want to tell him about the sort of devastation in her version of earth. "But there are a lot of worlds that will have histories that are exactly the same, up to a certain point. And the ones that don't will still have things in common with other worlds. The only way to know it's not yours is to see if we can find anyone that was alive in that time. Not an impossible feat, but it won't be easy either." She hoped to find something that would help him. What that was... Well she wasn't exactly privy to that information.