Jack narrows his eyes, for a moment, trying to remember if there was (sometimes, things that weren't important were sort of fuzzy thanks to being buried alive for all of those years), but no. Nothing that took out a tenth of the population, if there was something to happen then, he would have remembered that.

Jack shakes his head. "Nope, not that I can recall. Were there any mass sightings of strange things flying over London that the government passed off as hallucinogenics in the water?"